statistics
posted by Anonymous .
For a normal distribution, identify the zscore location that would separate the distribution into sections so that there is:
a)60% in the body on the righthand side
b)90% in the body on the lefthand side

60% is to the right of z = 0.25
90% is to the left of z = +1.28
"z" is (xx(mean))/{standard deviation)
You need a table of the error function or normal distribution to do this kind of problem.