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The mean weight of 500 male students at a certain college is 151 lb. And the standard deviation is 15 lb. Assume that the weights

The mean weight of 500 male students at a certain college is 151 lb. And the standard deviation is 15 lb. Assume that the weights are normally distributed.

a. How many students weigh between 120 and 155 lb? (answer in whole number):__________

b. What is the probability that a randomly selected male student weighs less than 128 pounds? (answer in 4 decimal answer):__________

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