Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 169. The distribution of the population is unknown. The mean and the standard error of the distribution of sample means are _____.单项选择题

A

180 and 1.62

B

180 and 1.74

C

180 and 24.39

D

None of the other three

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