Assume that the heights of men are normally distributed with a mean of 66.9 inches and a standard deviation of 2.1inches. if 36 men are randomly selected, find the probability that they have a mean height greater than 67.9 inches.
a. 0.0021
b. 0.0210
c. 0.9979
d. 0.9005

A. 0.0021

Step-by-step explanation:

Given that the heights of men are normally distributed with a mean of 66.9 inches and a standard deviation of 2.1inches.

Sample size = 36

Std dev of sample =

The sample entries X the heights are normal with mean= 66.9 inches and std deviation = 0.35 inches

Or we have

Z =

Hence the probability that they have a mean height greater than 67.9 inches

=

So option A is right answer.

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2x^2+5x+17

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