The population's mean is 30 and the mean of a sample of size 100 is 28.5. The variance of the sample is 25. The standard error of the sample mean is closest to: —— 财会经济>CFA特许金融分析师 > CFA考试（Level Ⅰ） > Study Session 3　Quantitative Methods Application

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1. The population's mean is 30 and the mean of a sample of size 100 is 28.5. The variance of the sample is 25. The standard error of the sample mean is closest to:

A.0.05.
B.0.25.
C.0.50.

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