Home > Maths > Handling data > Measures of average
The mean is the most common measure of average.
To calculate the mean add the numbers together and divide the total by the amount of numbers:
Mean = sum of numbers ÷ amount of numbers
Five friends compare their marks in a French test. These are shown below:
Name | Mark |
---|---|
Shabana | 41 |
Bea | 54 |
Liam | 79 |
Dave | 26 |
Ed | 65 |
What is the mean mark?
Mean = (41 + 54 + 79 + 26 + 65) ÷ 5
= 265 ÷ 5
= 53
Check your answer by asking yourself if it looks about right. If you had forgotten to divide by 5 then the answer would have been 265, which would not have made sense. Always check that your answer seems sensible.
A die is thrown 10 times. The following results are obtained:
3, 5, 1, 2, 6, 4, 2, 5, 6, 1
What is the mean score?
To find the answer, add the numbers together and divide by the amount of numbers:
Mean = (3 + 5 + 1 + 2 + 6 + 4 + 2 + 5 + 6 + 1) ÷ 10
35 ÷ 10 = 3.5
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