Question: A Nielsen study indicates that 18 to 24 year old spend a mean of 135 minutes watching video on their smartphones per month. (Data extracted

A Nielsen study indicates that 18 to 24 year old spend a mean of 135 minutes watching video on their smartphones per month. (Data extracted bit. ly/1hF3BP2.) Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes.

a. What is the probability that an 18 to 24 year-old spends less than 112 minutes watching video on his or her smartphone per month?

b. What is the probability that an 18 to 24 year old spends between 112 and 158 minutes watching video on his or her smart-phone per month?

c. What is the probability that an 18 to 24 year old spends more than 158 minutes watching video on his or her smartphone per month?

d. One percent of all 18 to 24 year old will spend less than how many minutes watching video on his or her smartphone per month?

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