Suppose X has a chi-squared distribution with 10 degrees of freedom. The mean of X is:
A. 10
B. 9
C. 20
D. None of these choices.
Analysis:
A. Correct. The mean of X is 10
B. Incorrect. The mean of X is 10
C. Incorrect. The mean of X is 10
D. Incorrect. The mean of X is 10
ANSWER : A
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