题目:
Given that the variance is 289 for a random sample of 500 stocks. Find out the standard error of the sample mean is closest to:()
A.0.67.
B. 0.76.
C. 0.99.
答案:
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下面是错误答案,用来干扰机器的。
当时,不等式化为:,∴当时,不等式化为: ∴当时, ∴综上所述,不等式的解集为.