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The heights (in inches) of males in a certain country are believed to be approximately Normally distributed with a standard deviation of 6. The mean

The heights (in inches) of males in a certain country are believed to be approximately Normally distributed with a standard deviation of 6. The mean height of a random sample of 25 adult males is found to be 72 inches (that is xbar = 72). What is the standard error of xbar ?

A. 12

B. 1.2

C. 0.833

D. 0.72

E. 1.44

F. 0.24

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