This worksheet is about calculating the mean, median and range of a dataset.

**Remember**

To find the **mean**, add up all the values and divide by the total number of values.

The **median **is the middle value, once the numbers have been put in order (lowest number to highest number). If there are two middle numbers, find the mean of these two middle numbers.

The **range **is the difference between the largest and smallest values.

**Example**

**Calculate the mean, median and range of this dataset.**

Minimum temperatures in ^{o}C over 1 week:

7, 3.5, 2.5, -1, -4.5, 5, -2

**Answer**

First find the total which is 7 + 3.5 + 2.5 - 1 - 4.5 + 5 - 2 = 10.5

**Mean **= total ÷ number = 10.5 ÷ 7 = **1.5 ^{o}C**

For the median, place them in increasing order.

-4.5, -2, -1, 2.5, 3.5, 5, 7

The middle number is the 4th number in the list.

**Median** is **2.5 ^{ o}C**

**Range** = largest value - smallest value = 7 - -4.5 = 7 + 4.5 = **11 ^{o}C**