易哈佛 \ 2020年工商(经企)管理硕士入学考试(GMAT)

Closing prices for a certain stock were recorded e...

2020年工商(经企)管理硕士入学考试(GMAT)考点真题库

[单项选择题]Closing prices for a certain stock were recorded each day for a week in the table above. If the monthly average (arithmetic mean) was 18.43 and the standard deviation was 0.27, how many days during this week did the closing price fall within two standard deviations from the average?

关键词: the standard average
A. 1 B. 2 C. 3 D. 4 E. 5

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