3) The mean weight of 500 male students at a certain college is 152 lb. And the standard deviation is 15 lb. Assume that the weights are normally distributed. How many students weigh between 120 and 155 lb?

3) The mean weight of 500 male students at a certain college is 152 lb. And the standard deviation is 15 lb. Assume that the weights are normally distributed. How many students weigh between 120 and 155 lb?

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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(Q13) The mean weight of 500 male students at a certain college is 152 lb. And the standard deviation is 15 lb. Assume that the weights are normally distributed.

How many students weigh between 120 and 155 lb?
What is the probability that a randomly selected male student weighs less than 128 pounds?

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