month is 0.1587 . (Round to four decimal places as needed.) 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? One percent of all 18- to 24-year-olds will spend less than minutes watching video on his or her smartphone per month. (Round to two decimal places as needed.)
month is 0.1587 . (Round to four decimal places as needed.) 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? One percent of all 18- to 24-year-olds will spend less than minutes watching video on his or her smartphone per month. (Round to two decimal places as needed.)
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A study indicates that 18- to 24- year olds spend a mean of 115 minutes watching video on their smartphones per month.
Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard
deviation is 20 minutes. Complete parts (a) through (d) below.
a. What is the probability that an 18- to 24-year-old spends less than 90 minutes watching video on his or her smartphone
per month?
The probability that an 18- to 24-year-old spends less than 90 minutes watching video on his or her smartphone per
month is 0.1057 .
(Round to four decimal places as needed.)
b. What is the probability that an 18- to 24-year-old spends between 90 and 135 minutes watching video on his or her
smartphone per month?
The probability that an 18- to 24-year-old spends between 90 and 135 minutes watching video on his or her smartphone
per month is 0.7357 .
(Round to four decimal places as needed.)
c. What is the probability that an 18- to 24-year-old spends more than 135 minutes watching video on his or her
smartphone per month?
The probability that an 18- to 24-year-old spends more than 135 minutes watching video on his or her smartphone per
month is 0.1587 .
(Round to four decimal places as needed.)
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?
One percent of all 18- to 24-year-olds will spend less than minutes watching video on his or her smartphone per
month.
(Round to two decimal places as needed.)
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