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Mathematics 11 Online
OpenStudy (kj4uts):

A sample of 144 was taken from a population with a standard deviation of 36 inches. In this case, the sample mean will be within how many inches of the population mean 99.7% of the time? A. 9 B. 6 C. 3 D. 12

OpenStudy (perl):

mean +/- z score * standard error mean +/- z score * (standard deviation of population) / sqrt(n) 144 +/- 3* 36 / sqrt(144)

OpenStudy (kj4uts):

@perl 3* 36 / sqrt(144) = 9

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