Question

The distribution of cholesterol levels in teenage boys is approximately normal with u=170 and o=30. Levels above 200 warrent attention. Find the probability that boy has a cholesterol level greater than 225.
Z = (score-mean)/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 you calculate.
how many seven digit telephone numbers are possible if digits can be repeated?

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