If four numbers have a mean of 10, what is their total sum?

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Multiple Choice

If four numbers have a mean of 10, what is their total sum?

Explanation:
Think of the mean as the total amount spread evenly across all numbers. If the average of four numbers is 10, then the total sum is the average multiplied by how many numbers there are: 10 × 4 = 40. So the four numbers add up to 40, and you can check by dividing 40 by 4 to get back the mean, which is 10. The other totals would come from different means (for example, a total of 36 would give a mean of 9, a total of 44 would give a mean of 11, and a total of 32 would give a mean of 8).

Think of the mean as the total amount spread evenly across all numbers. If the average of four numbers is 10, then the total sum is the average multiplied by how many numbers there are: 10 × 4 = 40. So the four numbers add up to 40, and you can check by dividing 40 by 4 to get back the mean, which is 10. The other totals would come from different means (for example, a total of 36 would give a mean of 9, a total of 44 would give a mean of 11, and a total of 32 would give a mean of 8).

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