问题
单项选择题
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. 360.
B. 540.
C. 756.
答案
参考答案：C
解析：
Chebyshev's inequality states that 1-1/k2=1-1/(2.52)=84%, 900×84%=756.