Question 229808
Assume that the population of heights of female college students is approximately normally distributed with mean m of 70 inches and standard deviation s of 4.00 inches. A random sample of 18 heights is obtained. Show all work. 

(A) Find the proportion of male college students whose height is greater than 68 inches.
Find the z-value of 68 in the population.
z(68) = (68-70)/4 = 1/2
P(x > 68) = P(z > 1/2) = 0.3085..
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(B) Find the mean and standard error of the distribution
I guess you want the mean of the sample means and the standard deviation
of the sample means:
Mean of the sample means is the same as the mean of the population: 70 
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Standard deviation of the means is 4/sqrt(18)
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Cheers,
stan H.