What is the probability that an 18- to 24-year-old mobile subscriber spends less than 300 minutes watching video on his or her mobile device in a given month? b. What is the probability that, for 2 randomly selected 18- to 24-year-old mobile subscribers, both spent less than 300 minutes watching video on their mobile device in a given month? c. What is the probability that, for 2 randomly selected 18- to 24-year-old mobile subscribers, the sum of time they spent watching video on their mobile device in a given month is less than 600 minutes? d. What is the number of minutes such that 25% of all 18- to 24-year-old mobile subscribers will spend less than that number of minutes watching video on his or her mobile device per month?
An ACNielsen study indicates that mobile subscribers between 18 and 24 years of age spend a substantial amount of time watching video on their devices, reporting a mean of 325 minutes per month. Assume that the amount of time spent watching video on a mobile device per month is
normally distributed and that the standard deviation is 50 minutes.
a. What is the
b. What is the probability that, for 2 randomly selected 18- to 24-year-old mobile subscribers, both spent less than 300 minutes watching video on their mobile device in a given month?
c. What is the probability that, for 2 randomly selected 18- to 24-year-old mobile subscribers, the sum of time they spent watching video on their mobile device in a given month is less than 600 minutes?
d. What is the number of minutes such that 25% of all 18- to 24-year-old mobile subscribers will spend less than that number of minutes watching video on his or her mobile device per month?
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