Basic Business Statistics
Basic Business Statistics
14th Edition
ISBN: 9780134684840
Author: BERENSON, Mark L., Levine, David M., Szabat, Kathryn A.
Publisher: Pearson,
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Chapter 6, Problem 11PS

A Nielsen study indicates that 18-to 34-year olds spend a mean of 93 minutes watching video on their smartphones per week.

Assume that the amount of time watching video on a smartphone per week is normally distributed and that standard deviation is 15 minutes.

a. What is the probability that an 18- to 34-year-old spends less than 77 minutes watching video on his or her smartphone per week?

b. What is the probability that an 18-to 34-year -old spends between 77 minutes and 109 minutes video on his or her smartphone per week?

c. What is the probability that an 18-to 34-year -old spends more than 109 minutes watching video on his or her smartphone per week?

d. One percent of all 18- to 34-year- olds will spend less than how many minutes watching video on her smartphone per week?

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