In this worksheet, you will find 40 questions that include many of the **level 2 **topics that you have learned this year.

Work through the questions carefully.

Calculators may **not **be used *unless *the question says that you may use one.

Good luck!

This is a level 2 revision exercise to help prepare for Year 11/end of Key Stage 4 tests.

In this worksheet, you will find 40 questions that include many of the **level 2 **topics that you have learned this year.

Work through the questions carefully.

Calculators may **not **be used *unless *the question says that you may use one.

Good luck!

Is the following number rational or irrational?

^{3}√729

rational

irrational

You may use a calculator for this question.

Select the recurring decimal which is equal to:

127 |

225 |

1.

2.

3.

Work out, without a calculator:

9^{1/}^{3} × 3^{1/3}

Work out:

7 | - | 5 | × | 7 |

15 | 6 | 10 |

*(Give your answer as a fraction, reduced to its lowest terms, e.g. 7/10.)*

Place these numbers in **ascending **order of size, by converting them to decimals first:

8.9% 1/11 9 × 10^{-2} 0.01^{½} 0.31^{2}

## Column A | ## Column B |

1 (smallest) | 1/11 |

2 | 8.9% |

3 | 9 × 10 ^{-2} |

4 | 0.31 ^{2} |

5 (largest) | 0.01 ^{½} |

The number n has been rounded to the **nearest thousand**, to get 73 000.

**A** and **B** are the upper and lower bounds for n, such that A ≤ n < B.

Select the correct values for A and B, the lower and upper bounds.

*(Write the number without spaces between the numbers.)*

value | |

A | |

B |

Rationalise the denominator of this fraction giving your answer as a surd in the form a√b, where a and b are integers and b is as small as possible.

2 |

√3 |

5√25

(√5)/5

(2√3)/3

Subtract:

3 × 10^{2} - 4 × 10^{-1}

3.4 × 10^{1}

2.996 × 10^{2}

2.6 × 10^{2}

Rearrange the following equation so that it is in the form** ax + by = c**,

where a ≥ 0, a, b and c are integers and the HCF of a, b, and c is 1.

½y = -4 - 2x

4x + y = 8

4x + y = -8

4x + 2y = -8

Solve the following equation for x:

x | - | 4x | = | -6 |

2 | 5 |

*(Just write the number.)*

Factorise the following quadratic expression.

4x^{2} + 39x - 10

(4x - 5) (x + 2)

(4x + 1) (x - 10)

(x - 2) (4x + 5)

(4x - 1) (x + 10)

Use the quadratic formula to solve for x, giving your answers to 3 sig. figs.

3x^{2} - 19x + 2 = 0

x = -3.23

x = 6.23

x = -4.107

x = 0.107

Select **all **the possible equations for the curve labelled **B** below.

y = x² - 5x - 6

y = (x + 2) (x + 3)

y = (x - 2) (x - 3)

y = (x + 3) (x + 2)

y = x² + 5x + 6

Find the y-intercept of the graph with the following equation:

(i.e. where the line crosses the y-axis)

3x - 12y = 6

(0, -2)

(2, 0)

(-½, 0)

(0, -½)

Divide the following expression by 2x.

4x^{4} - 6x^{3} + 10x^{2} - 2x

8x^{6} - 2x^{3} + 5x^{2} - x

2x^{4} - 3x^{3} + 5x^{2} - x

2x^{3} - 3x^{2} + 5x^{} - 1

Find the gradient of a line **perpendicular **to the line with equation:

5x - 10y = 2

Solve for x:

6x^{3} - 109 = -365 + 2x^{3}

*(Just write the number.*)

Simplify the following algebraic fraction by first factorising the top or the bottom.

49x^{8 }- 35x^{5} |

7x^{5} - 5x^{2} |

7x^{4}

7x^{3}

7x^{2}

You may use a calculator for this question.

Bill invests £1000 at 2.5% interest p.a.

How much compound interest is earned in pounds after three years?

*(Just write the number with 2 decimal places.)*

You may use a calculator for this question.

Given that y is **directly proportional** to x and that** x = 19 when y = 123.5**,

find the value of **x** when **y = 29.25**.

3 mice take 8 days to eat a block of cheese.

How many days would it take 4 mice to eat a similar block of cheese?

*(Just write the number.)*

You may use a calculator for this question.

A bank pays 4% compound interest.

If I invest £100 now, how many years will it take for me to double my money at this fixed rate?

*(Just write the number.)*

You may use a calculator for this question.

Look at the function:

**f(t) = 3 ^{t} + 10**

Work out** f(7) - f(5)**.

Look at this graph.

What is the equation of the blue line?

y = 10x

y = 10/x

y = 10x²

y = 10x³

You may use a calculator for this question.

Calculate the **curved surface area** (in cm^{2}) of a cone with **radius R equal to 3 cm** and **height H equal to 4 cm**.

*(Write your answer to 1 dp and just write the number.)*

You may use a calculator for this question.

Calculate the length of the following vector to 3 sig. figs.:

( | -8 | ) |

-9 |

You may use a calculator for this question.

Find the length of the cuboid's diagonal **AG **of this 4 cm × 5 cm × 10 cm cuboid in cm to 3 sig. figs.

*(Just write the number.)*

Without using a calculator, state the value of:

cos 30°

2/√3

√3/2

√2/3

3/2

3/√2

Use the sine graph shown below to state the value of:

sin 330°

*(Give your answer as a decimal.)*

You may use a calculator for this question.

Fred's eye level is 1.6 metres above ground.

He is standing on a cliff which is h metres above sea level and measures the angle of depression to a boat 400 m away as 26°.

Calculate the **height **of the cliff, **h**, in metres.

*(Give your answer as a number to 1 decimal place.)*

You may use a calculator for this question.

In triangle **PQR**, which is not drawn to scale,

PR = 19 cm, ∠PQR = 102° and ∠PRQ = 37°.

Use the sine rule to find the length of **PQ** in cm to 1 dp.

*(Just write the number.)*

You may use a calculator for this question.

In triangle PQR, which is not drawn to scale,

PQ = 4.5 cm, QR = 10 cm, and PR = 12 cm.

Use the cosine rule to find ∠PRQ to the nearest degree.

*(Just write the number.)*

A money bag contains 20 × £1 coins, 25 × 50p coins, n × 20p coins, 10 × 10p coins and 5 × 2p coins.

The **probability **that a 10p coin is selected at random is **2/19**.

Calculate **n**, the number of **20p coins** in the bag.

Two fair dice are thrown.

What is the **probability **that the two dice will **both **show **prime numbers**?

*(Write your answer as a fraction in the form a/b in its lowest terms.)*

Mr. Brown chose the children who came in the top ten positions in an English exam to survey them about a new novel.

Is the sample likely to be biased?

yes

no

A shopping centre has 3 entrances, A, B and C.

They are being repaired and only one entrance will ever be open at any one time.

The probability that Entrance A is open is 2/5. The probability that Entrance B is open is 1/4.

What is the **probability **that **Entrance C **is open?

*(Write your answer as a fraction in the form a/b in its lowest terms.)*

A survey was carried out to record the marks some students scored in a test.

The marks were as follows:

**25, 51, 20, 25, 18, 40, 30, 30, 40, 30, 19**

Which box plot shows this information?

A

B

C

none of them

A survey of 100 people was carried out to see how many times they checked their email at the weekend.

The frequencies and cumulative frequencies are shown in the table below.

Calculate the value of C in this table.

Times (n) | freq (f) | cumulative freq |
---|---|---|

0 ≤ n ≤ 5 | A | 7 |

5 < n ≤ 10 | 9 | |

10 < n ≤ 15 | B | 55 |

15 < n ≤ 20 | 35 | |

20 < n ≤ 25 | C | |

Total | 100 |

Find the** lower quartile **of the following set of data:

16 9 1 15 11 14 10 4 3

The ages of 100 young people attending a holiday club are recorded.

The following table shows the distribution of ages.

Age (years) | frequency (f) |
---|---|

0 < a < 5 | 5 |

5 ≤ a < 10 | 15 |

10 ≤ a < 16 | 24 |

16 ≤ a < 18 | 38 |

18 ≤ a < 30 | 18 |

Total | 100 |

Work out the **Frequency Density** for the** 18 ≤ a < 30** class interval.

- ANSWERS

- Question 1

Is the following number rational or irrational?

^{3}√729

CORRECT ANSWER

rational

EDDIE SAYS

³√729 = 9 which can be written as 9/1.

- ANSWERS

- Question 2

You may use a calculator for this question.

Select the recurring decimal which is equal to:

127 |

225 |

CORRECT ANSWER

2.

EDDIE SAYS

127 ÷ 225 = 0.5644444444...

The 4 recurs.

A dot only goes on the 4 but not on the 5 or 6, because these digits don't recur.

The 4 recurs.

A dot only goes on the 4 but not on the 5 or 6, because these digits don't recur.

- ANSWERS

- Question 3

Work out, without a calculator:

9^{1/}^{3} × 3^{1/3}

CORRECT ANSWER

3

EDDIE SAYS

= (9 × 3)^{1/3}

= 27^{1/3}

=^{3}√27

= 3

= 27

=

= 3

- ANSWERS

- Question 4

Work out:

7 | - | 5 | × | 7 |

15 | 6 | 10 |

*(Give your answer as a fraction, reduced to its lowest terms, e.g. 7/10.)*

CORRECT ANSWER

-7/60

EDDIE SAYS

First work out 5/6 × 7/10 = 7/12.

Then work out 7/15 - 7/12 = 28/60 - 35/60 = -7/60.

Then work out 7/15 - 7/12 = 28/60 - 35/60 = -7/60.

- ANSWERS

- Question 5

Place these numbers in **ascending **order of size, by converting them to decimals first:

8.9% 1/11 9 × 10^{-2} 0.01^{½} 0.31^{2}

CORRECT ANSWER

## Column A | ## Column B |

1 (smallest) | 8.9% |

2 | 9 × 10 ^{-2} |

3 | 1/11 |

4 | 0.31 ^{2} |

5 (largest) | 0.01 ^{½} |

EDDIE SAYS

8.9% = 0.089

9 × 10^{-2} = 0.09

1/11 = 0.0909...

0.31^{2} = 0.0961

0.01^{½} = √0.01 = 0.1

9 × 10

1/11 = 0.0909...

0.31

0.01

- ANSWERS

- Question 6

The number n has been rounded to the **nearest thousand**, to get 73 000.

**A** and **B** are the upper and lower bounds for n, such that A ≤ n < B.

Select the correct values for A and B, the lower and upper bounds.

*(Write the number without spaces between the numbers.)*

CORRECT ANSWER

value | |

A | |

B |

EDDIE SAYS

The number n lies between 72 500 and 73 500, in order for it to be rounded to 73 000 to the nearest thousand.

- ANSWERS

- Question 7

Rationalise the denominator of this fraction giving your answer as a surd in the form a√b, where a and b are integers and b is as small as possible.

2 |

√3 |

CORRECT ANSWER

(2√3)/3

EDDIE SAYS

Multiply top and bottom by √3.

- ANSWERS

- Question 8

Subtract:

3 × 10^{2} - 4 × 10^{-1}

CORRECT ANSWER

2.996 × 10^{2}

EDDIE SAYS

3 × 10^{2} = 300

4 × 10^{-1} = 0.4

300 - 0.4 = 299.6 = 2.996 × 10^{2}

4 × 10

300 - 0.4 = 299.6 = 2.996 × 10

- ANSWERS

- Question 9

Rearrange the following equation so that it is in the form** ax + by = c**,

where a ≥ 0, a, b and c are integers and the HCF of a, b, and c is 1.

½y = -4 - 2x

CORRECT ANSWER

4x + y = -8

EDDIE SAYS

½y = -4 - 2x

2x + ½y = -4

4x + y = -8

2x + ½y = -4

4x + y = -8

- ANSWERS

- Question 10

Solve the following equation for x:

x | - | 4x | = | -6 |

2 | 5 |

*(Just write the number.)*

CORRECT ANSWER

20

EDDIE SAYS

Multiply each term by 10 to get:

5x - 8x = -60

-3x = -60

x = 20

5x - 8x = -60

-3x = -60

x = 20

- ANSWERS

- Question 11

Factorise the following quadratic expression.

4x^{2} + 39x - 10

CORRECT ANSWER

(4x - 1) (x + 10)

EDDIE SAYS

We look for factor pairs that multiply to give -40 and add to give +39.

These are 40 and -1.

Factorise 4x² + 40x - x - 10 in pairs.

These are 40 and -1.

Factorise 4x² + 40x - x - 10 in pairs.

- ANSWERS

- Question 12

Use the quadratic formula to solve for x, giving your answers to 3 sig. figs.

3x^{2} - 19x + 2 = 0

CORRECT ANSWER

x = 6.23

x = 0.107

x = 0.107

EDDIE SAYS

a=3 b=-19 c=2

- ANSWERS

- Question 13

Select **all **the possible equations for the curve labelled **B** below.

CORRECT ANSWER

y = (x + 2) (x + 3)

y = (x + 3) (x + 2)

y = x² + 5x + 6

y = (x + 3) (x + 2)

y = x² + 5x + 6

EDDIE SAYS

The line passes through (-3, 0) and (-2, 0), so y = (x + 2)(x + 3).

This is y = x² + 5x + 6.

This is y = x² + 5x + 6.

- ANSWERS

- Question 14

Find the y-intercept of the graph with the following equation:

(i.e. where the line crosses the y-axis)

3x - 12y = 6

CORRECT ANSWER

(0, -½)

EDDIE SAYS

When x = 0,

-12y = 6

y = -½

-12y = 6

y = -½

- ANSWERS

- Question 15

Divide the following expression by 2x.

4x^{4} - 6x^{3} + 10x^{2} - 2x

CORRECT ANSWER

2x^{3} - 3x^{2} + 5x^{} - 1

EDDIE SAYS

4x^{4} |
- | 6x^{3} |
+ | 10x^{2} |
- | 2x^{} |

2x^{} |
2x^{} |
2x^{} |
2x^{} |

- ANSWERS

- Question 16

Find the gradient of a line **perpendicular **to the line with equation:

5x - 10y = 2

CORRECT ANSWER

-2

EDDIE SAYS

5x - 2 = 10y

y = ½x - 0.2 has a gradient of ½.

Product of gradients of perpendicular lines is always -1, so gradient of perpendicular line will be -2, since -2 × ½ = -1.

y = ½x - 0.2 has a gradient of ½.

Product of gradients of perpendicular lines is always -1, so gradient of perpendicular line will be -2, since -2 × ½ = -1.

- ANSWERS

- Question 17

Solve for x:

6x^{3} - 109 = -365 + 2x^{3}

*(Just write the number.*)

CORRECT ANSWER

-4

EDDIE SAYS

6x³ - 109 = -365 + 2x³

Add 109 and subtract 2x³ from both sides to get:

4x³ = -256

Divide both sides by 3 to get:

x³ = -64

Cube root both sides to get:

x = ³√-64 = -4

Add 109 and subtract 2x³ from both sides to get:

4x³ = -256

Divide both sides by 3 to get:

x³ = -64

Cube root both sides to get:

x = ³√-64 = -4

- ANSWERS

- Question 18

Simplify the following algebraic fraction by first factorising the top or the bottom.

49x^{8 }- 35x^{5} |

7x^{5} - 5x^{2} |

CORRECT ANSWER

7x^{3}

EDDIE SAYS

7x^{3}^{5} - 5x^{2})^{
} |

^{5} - 5x^{2} |

- ANSWERS

- Question 19

You may use a calculator for this question.

Bill invests £1000 at 2.5% interest p.a.

How much compound interest is earned in pounds after three years?

*(Just write the number with 2 decimal places.)*

CORRECT ANSWER

76.89

EDDIE SAYS

1000 × 1.025³ - 1000

- ANSWERS

- Question 20

You may use a calculator for this question.

Given that y is **directly proportional** to x and that** x = 19 when y = 123.5**,

find the value of **x** when **y = 29.25**.

CORRECT ANSWER

4.5

EDDIE SAYS

y = kx

123.5 = 19k

k = 123.5 ÷ 19 = 6.5

y = 6.5x

x = y ÷ 6.5 = 29.25 ÷ 6.5 = 4.5

123.5 = 19k

k = 123.5 ÷ 19 = 6.5

y = 6.5x

x = y ÷ 6.5 = 29.25 ÷ 6.5 = 4.5

- ANSWERS

- Question 21

3 mice take 8 days to eat a block of cheese.

How many days would it take 4 mice to eat a similar block of cheese?

*(Just write the number.)*

CORRECT ANSWER

6

EDDIE SAYS

It would take 1 mouse 24 days.

- ANSWERS

- Question 22

You may use a calculator for this question.

A bank pays 4% compound interest.

If I invest £100 now, how many years will it take for me to double my money at this fixed rate?

*(Just write the number.)*

CORRECT ANSWER

18

EDDIE SAYS

1.04^{17} = 1.9479...

1.04^{18} = 2.0258...

1.04

- ANSWERS

- Question 23

You may use a calculator for this question.

Look at the function:

**f(t) = 3 ^{t} + 10**

Work out** f(7) - f(5)**.

CORRECT ANSWER

1944

EDDIE SAYS

3^{5} + 10 = 253

3^{7} + 10 = 2197

Difference = 2197 - 253 = 1944

3

Difference = 2197 - 253 = 1944

- ANSWERS

- Question 24

Look at this graph.

What is the equation of the blue line?

CORRECT ANSWER

y = 10/x

EDDIE SAYS

Test out coordinates, e.g. when x = 2, y = 5, and when x = 5, y = 2.

This is the exponential curve y = 10/x.

This is the exponential curve y = 10/x.

- ANSWERS

- Question 25

You may use a calculator for this question.

Calculate the **curved surface area** (in cm^{2}) of a cone with **radius R equal to 3 cm** and **height H equal to 4 cm**.

*(Write your answer to 1 dp and just write the number.)*

CORRECT ANSWER

47.1

EDDIE SAYS

This is a 3, 4, 5 Pythagorean Triad, so slant length, l, = 5.

Curved Surface Area = π × R × l = π × 3 × 5

Curved Surface Area = π × R × l = π × 3 × 5

- ANSWERS

- Question 26

You may use a calculator for this question.

Calculate the length of the following vector to 3 sig. figs.:

( | -8 | ) |

-9 |

CORRECT ANSWER

12.0

EDDIE SAYS

a² = (-8)² + (-9)² = 64 + 81 = 145

- ANSWERS

- Question 27

You may use a calculator for this question.

Find the length of the cuboid's diagonal **AG **of this 4 cm × 5 cm × 10 cm cuboid in cm to 3 sig. figs.

*(Just write the number.)*

CORRECT ANSWER

11.9

EDDIE SAYS

Use Pythagoras' Theorem to get:

AG² = 4² + 5² + 10² = 16 + 25 + 100 = 141

AG² = 4² + 5² + 10² = 16 + 25 + 100 = 141

- ANSWERS

- Question 28

Without using a calculator, state the value of:

cos 30°

CORRECT ANSWER

√3/2

EDDIE SAYS

In the blue triangle, cos 30° = adj/hyp = √3/2

- ANSWERS

- Question 29

Use the sine graph shown below to state the value of:

sin 330°

*(Give your answer as a decimal.)*

CORRECT ANSWER

-0.5

EDDIE SAYS

sin330° = - sin30° = -0.5

- ANSWERS

- Question 30

You may use a calculator for this question.

Fred's eye level is 1.6 metres above ground.

He is standing on a cliff which is h metres above sea level and measures the angle of depression to a boat 400 m away as 26°.

Calculate the **height **of the cliff, **h**, in metres.

*(Give your answer as a number to 1 decimal place.)*

CORRECT ANSWER

193.5

EDDIE SAYS

(h + 1.6)/400 = tan26°

h + 1.6 = 400tan26° = 195.093035

h = 193.493...

h + 1.6 = 400tan26° = 195.093035

h = 193.493...

- ANSWERS

- Question 31

You may use a calculator for this question.

In triangle **PQR**, which is not drawn to scale,

PR = 19 cm, ∠PQR = 102° and ∠PRQ = 37°.

Use the sine rule to find the length of **PQ** in cm to 1 dp.

*(Just write the number.)*

CORRECT ANSWER

11.7

EDDIE SAYS

PQ | = | 19 |

sin 37° | sin 102° |

- ANSWERS

- Question 32

You may use a calculator for this question.

In triangle PQR, which is not drawn to scale,

PQ = 4.5 cm, QR = 10 cm, and PR = 12 cm.

Use the cosine rule to find ∠PRQ to the nearest degree.

*(Just write the number.)*

CORRECT ANSWER

21

EDDIE SAYS

4.5² = 10² + 12² - 2 × 10 × 12 × cosθ°

cosθ° = (4.5² - 10² - 12²) ÷ -(2 × 10 × 12) = 0.93229...

θ° = 21.205...

cosθ° = (4.5² - 10² - 12²) ÷ -(2 × 10 × 12) = 0.93229...

θ° = 21.205...

- ANSWERS

- Question 33

A money bag contains 20 × £1 coins, 25 × 50p coins, n × 20p coins, 10 × 10p coins and 5 × 2p coins.

The **probability **that a 10p coin is selected at random is **2/19**.

Calculate **n**, the number of **20p coins** in the bag.

CORRECT ANSWER

35

EDDIE SAYS

10/(60 + n) = 2/19

190 = 2(60 + n)

190 = 120 + 2n

2n = 70

n = 35

190 = 2(60 + n)

190 = 120 + 2n

2n = 70

n = 35

- ANSWERS

- Question 34

Two fair dice are thrown.

What is the **probability **that the two dice will **both **show **prime numbers**?

*(Write your answer as a fraction in the form a/b in its lowest terms.)*

CORRECT ANSWER

1/4

EDDIE SAYS

There are 9 results that have double prime numbers out of 36.

(2, 2) (2, 3) (2, 5)

(3, 2) (3, 3) (3, 5)

(5, 2) (5, 3) (5, 5)

(2, 2) (2, 3) (2, 5)

(3, 2) (3, 3) (3, 5)

(5, 2) (5, 3) (5, 5)

- ANSWERS

- Question 35

Mr. Brown chose the children who came in the top ten positions in an English exam to survey them about a new novel.

Is the sample likely to be biased?

CORRECT ANSWER

yes

EDDIE SAYS

Those who were not in the top ten may have completely different opinions.

- ANSWERS

- Question 36

A shopping centre has 3 entrances, A, B and C.

They are being repaired and only one entrance will ever be open at any one time.

The probability that Entrance A is open is 2/5. The probability that Entrance B is open is 1/4.

What is the **probability **that **Entrance C **is open?

*(Write your answer as a fraction in the form a/b in its lowest terms.)*

CORRECT ANSWER

7/20

EDDIE SAYS

1 - 1/4 - 2/5 = 20/20 - 5/20 - 8/20 = 7/20

- ANSWERS

- Question 37

A survey was carried out to record the marks some students scored in a test.

The marks were as follows:

**25, 51, 20, 25, 18, 40, 30, 30, 40, 30, 19**

Which box plot shows this information?

CORRECT ANSWER

B

EDDIE SAYS

First place the marks in ascending order.

Minimum mark = 18

Lower quartile = 20

Median = 30

Upper quartile = 40

Maximum mark = 51

Minimum mark = 18

Lower quartile = 20

Median = 30

Upper quartile = 40

Maximum mark = 51

- ANSWERS

- Question 38

A survey of 100 people was carried out to see how many times they checked their email at the weekend.

The frequencies and cumulative frequencies are shown in the table below.

Calculate the value of C in this table.

Times (n) | freq (f) | cumulative freq |
---|---|---|

0 ≤ n ≤ 5 | A | 7 |

5 < n ≤ 10 | 9 | |

10 < n ≤ 15 | B | 55 |

15 < n ≤ 20 | 35 | |

20 < n ≤ 25 | C | |

Total | 100 |

CORRECT ANSWER

10

EDDIE SAYS

A = 7

B = 55 - 9 - 7 = 39

C = 100 - 35 - 39 - 9 - 7 = 10

B = 55 - 9 - 7 = 39

C = 100 - 35 - 39 - 9 - 7 = 10

- ANSWERS

- Question 39

Find the** lower quartile **of the following set of data:

16 9 1 15 11 14 10 4 3

CORRECT ANSWER

3.5

EDDIE SAYS

Put the numbers in order first to get 1, 3, 4, 9, 10, 11, 14, 15, 16.

Median of 1, 3, 4, 9 is 3.5.

Median of 1, 3, 4, 9 is 3.5.

- ANSWERS

- Question 40

The ages of 100 young people attending a holiday club are recorded.

The following table shows the distribution of ages.

Age (years) | frequency (f) |
---|---|

0 < a < 5 | 5 |

5 ≤ a < 10 | 15 |

10 ≤ a < 16 | 24 |

16 ≤ a < 18 | 38 |

18 ≤ a < 30 | 18 |

Total | 100 |

Work out the **Frequency Density** for the** 18 ≤ a < 30** class interval.

CORRECT ANSWER

1.5

EDDIE SAYS

Class width = 30 - 18 = 12

Frequency Density = 18 ÷ 12 = 1.5

Frequency Density = 18 ÷ 12 = 1.5

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