The number of cell phone minutes used by high school students follows a normal distribution with a

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The number of cell phone minutes used by high school students follows a normal distribution with a mean of 450 and a standard deviation of 40. What is the probability that a student uses less than 600 minutes?

2- A discrete random variable has a mean of 400 and a variance of 64. What is the standard deviation?

a.	20
b.	400
c.	8
d.	64
e.	None of the above

Related Book For answer-question

Income Tax Fundamentals 2013

ISBN: 9781285586618

31st Edition

Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill

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Posted Date: Dec 30, 2023 09:20 AM

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The number of cell phone minutes used by high school students follows a normal distribution with a

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