单选题 You are analyzing a sample of money manager's returns from a population of 900. According to Chebyshev's inequality, what is the minimum number of managers would you expect to lie with- in 2.5 standard deviations of the mean return?

A、

A. 360.
B、

B. 540.
C、

C. 756.

【正确答案】 C

【答案解析】
Chebyshev's inequality states that 1-1/k²=1-1/(2.5²)=84%, 900×84%=756.