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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.






__________


c. Find the probability that a man is randomly selected from the above population will have a weight between125 lbs and 215 lbs.






__________

  • statistics -

    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.

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