Posted by angela on .
Assume that women's heights are normally distributed with a mean given by u=64.6 in
and a standard deviation given by 0=2.8in.
a) If 1 woman is randomly selected, find the probability that her height is less than 65in.
b) If 49 women are randomly selected, find the probability that they have a mean height less than 65 in.

statistics 
Reiny,
great webpage for your problem, just plug in the values that you have
http://davidmlane.com/hyperstat/z_table.html 
statistics 
Kuai,
a.
z = (6564.6)/(2.8/sqrt(1))
z = 0.14
b.
z = (6564.6)/(2.8/sqrt(49))
z = 1