Posted by Sue 7 on .
Consider the approximately normal population of heights of male college students with mean ì = 69 inches and standard deviation of ó = 4.6 inches. A random sample of 25 heights is obtained
(e) Find P(x > 70). (Give your answer correct to four decimal places.)
(f) Find P(x < 67). (Give your answer correct to four decimal places.)
Not sure how to work these?

math help 
PsyDAG,
Does x = raw score or mean?
If raw score:
Z = (scoremean)/SD
If mean:
Z = (scoremean)/SEm
SEm = SD/√n
In both cases, find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability of Z. 
math help 
romina,
Find the reciprocal of the following number:
21/23 
math check 
Sue 7,
21/23=2.50=.9938 or is it 7069=1over4.6/sqrt25=.92=.8212 for the first one
the second part 6769=2over 4.6/sqrt25=.92, 2/.92=2.17=.0150