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The mean weight of 500 students at a certain college is 151 lb and the standard...

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Statistics

The mean weight of 500 students at a certain college is 151 lband the standard deviation is 15 lb. Assume that the weights arenormally distributed.
a.) How many students weigh between 120 and 155 lb? (ANSWER INWHOLE NUMBER)

b.) What is the probability that randomly selected male studentsto weigh less than 128 lb? (ANSWER IN 4 DECIMAL NUMBER)

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