# Question

A Nielsen study indicates that 18- to 24- year olds 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- olds will spend less than how many minutes watching video on his or her smartphone per month?

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- olds will spend less than how many minutes watching video on his or her smartphone per month?

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