If the mean of the observations x, x + 4, x + 5, x + 7, x + 9 is 9, then the mean of the last three observations is:

If the mean of the observations x, x + 4, x + 5, x + 7, x + 9 is 9, th

1.	If the mean of the observations x, x + 4, x + 5, x + 7, x + 9 is 9, then the mean of the last three observations is:
A.	7
B.	10
C.	11
D.	8
Answer» D. 8

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If the mean of the observations x, x + 4, x + 5, x + 7, x + 9 is 9, then the mean of the last three observations is:

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