The numbers 3, 7, x, 11 and 9 have a mean of 8. What is the value of x?
A8
B9
C10CORRECT
D11
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Why the answer is C, and why the others tempt you.
Mean = (3 + 7 + x + 11 + 9) / 5 = 8. So 30 + x = 40, therefore x = 10.
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