Posted by jimmy on Sunday, July 29, 2012 at 11:31pm.
Assume that women's heights are normally distributed with a mean=63.6 in. and standard deviation = 2.5 in.
a) To be eligible for the US Marine Corps, a woman must have a height between 58 in. and 73 in. Find the percentage of women who satisfy that requirement.
b)If the requirement is changed to exclude the shortest 1% and exclude the tallest 1%, find the heights that are acceptable.

statistics  MathGuru, Monday, July 30, 2012 at 5:37pm
Use zscores for both a) and b).
Formula:
z = (x  mean)/sd
a) Find both zscores.
First z: x = 58, mean = 63.6, sd = 2.5
Second z: x = 73, mean = 63.6, sd = 2.5
Once you have both zscores, check a ztable for the probability between the two scores. Convert to a percentage.
b) Find the two zscores using a ztable for the shortest 1% and the tallest 1%. Once you have both zscores, find x for both using the formula above, then go from there.
I hope this will help get you started.
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