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 the standard deviation is 15 minutes. What is the probability that an 18- to 34-year-old spends less than 60 minutes or more than 77 minutes watching video on his or her smartphone per week? (Round final answer to four decimal places)
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We are told that 18- to 34-year-olds spend a mean of 93 minutes watching video on their smartphones per week, with a standard deviation of 15 minutes. The distribution of time spent watching videos on smartphones is normally distributed. We are asked to find the Show more…
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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 the standard deviation is 15 minutes. 1- 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? 2- What is the probability that an 18- to 34-year-old spends between 77 minutes and 109 minutes watching video on his or her smartphone per week? 3- 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? 4- One percent of all 18- to 34-year-olds will spend less than how many minutes watching video on his or her smartphone per week?
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A Nielsen study indicates that 18- to 34-year-olds spend a mean of 93 minutes watching video on their smartphones per week. Source: Data extracted from bit.ly/2rj8GHm. Assume that the amount of time watching video on a smartphone per week is normally distributed and that the 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 watching 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 his or her smartphone per week?
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