Study Barn - The arithmetic mean (average) of 9, 29 and y is 19. What is the value of y?

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The arithmetic mean (average) of 9, 29 and y is 19. What is the value of y?

A. 7

B. 19

C. 26

D. 32

E. 57

The arithmetic mean of n numbers is their sum divided by n.
So, (9 + 29 + y) / 3 = 19 or 38 + y = 19 x 3 = 57. Thus, y = 57 - 38 = 19.

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Taken: 17 times

Added: 11/12/2008

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Taggged: Math, SAT

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