Calculating Means (Year 8 Maths)

The following test is covering 'Calculating Means' for Year 8 Maths.

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Question 1

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The mean of five numbers is 11. If one of the numbers is 9, what is the total of the other four numbers?

The mean of seven numbers is 10. What is their total?

If the mean of seven numbers is 9, what is their total?

What is the mean (average) of the series 10, 20, 30, 40, 50?

If the mean of four numbers is 5, what is their total?

The mean of three numbers is 12. If one of the numbers is 20, what is the total of the other two numbers?

If the mean of 3, 6, and 9 is x, what is the value of x?