Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportions/probabilities related to the Z scores.
Based on data from the National Health and Nutrition Examination Survey assume that the weights of men are normally distributed with a mean of 170 lbs. and a standard deviation of 30lbs.
a. Find the probability that a man randomly selected from the above population will have a weight equal to orless than 207.5 lbs.
b. Find the probability thata man randomly selected from the above population will have weight equal to or greater than 125 lbs.
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c. Find the probability that a man is randomly selected from the above population will have a weight between125 lbs and 215 lbs.
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1 answer
1 answer