The picture is the answer to a problem with n=500, standard deviation of 0.0155 and mean of 0.14. Can any one teach me how to get P(Z>3.87) and where .0002 came from? Thanks in advance.
My guess you were doing something about the normal distribution.
If so you need to look up 3.87 in a table of the cumulative standard normal distribution and subtract that from 1, but that does not give the given answer.