IXL | Mean: find the missing number

Hakim has the following data:

If the mean is 10, which number could u be?

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Learn with an example

Tom has the following data:

If the mean is 6, which number could u be?

The mean is the average of the numbers. You find the mean by adding the numbers together and then dividing by the number of numbers in the group.

There are 4 numbers in the group.

Try u = 13.

Find the sum of the numbers.

9 + 13 + 7 + 7 = 36

Divide by 4.

36 ÷ 4 = 9

When u = 13, the mean is 9.

Try u = 1.

Find the sum of the numbers.

9 + 1 + 7 + 7 = 24

Divide by 4.

24 ÷ 4 = 6

When u = 1, the mean is 6.

The mean is 6, so u = 1.

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