Posted by melba on Monday, June 11, 2012 at 4:44pm.
given x is a noramlly distributed random variable with a mean of 28 and a sd of 7 find p(x<28)

college statistics  PsyDAG, Tuesday, June 12, 2012 at 12:32pm
Z = (scoremean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.
However, since mean = 28, and in a normal distribution, the mean = median, and the median = 50th percentile, you would have your answer.
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