题目
设X_1,X_2,ldots,X_(16)是来自正态总体N(16,20^2)的简单随机样本，记overline(X)为样本均值，则overline(X)sim( )A. N(16,5^2)B. N(16,20^2)C. N(1,5^2)D. N(1,20^2)
设$X_1,X_2,\ldots,X_{16}$是来自正态总体$N(16,20^2)$的简单随机样本，记$\overline{X}$为样本均值，则$\overline{X}\sim($ $)$
A. $N(16,5^2)$
B. $N(16,20^2)$
C. $N(1,5^2)$
D. $N(1,20^2)$
题目解答
答案
A. $N(16,5^2)$