IXL | Mean: find the missing number

Victoria has the following data:

If the mean is 9, which number could m be?

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Learn with an example

Sophia has the following data:

If the mean is 4, which number could w 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 5 numbers in the group.

Try w = 11.

Find the sum of the numbers.

5 + 1 + 11 + 8 + 5 = 30

Divide by 5.

30 ÷ 5 = 6

When w = 11, the mean is 6.

Try w = 1.

Find the sum of the numbers.

5 + 1 + 1 + 8 + 5 = 20

Divide by 5.

20 ÷ 5 = 4

When w = 1, the mean is 4.

The mean is 4, so w = 1.

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