elean7392 elean7392

12-08-2024
Mathematics

Answered

How many apps? According to a website, the mean number of apps on a smartphone in the United States is 80. Assume the number of apps is normally distributed with mean 80 and standard deviation 28.
(a) What proportion of phones have between 66 and 91 apps?
(b) Find the 90th percentile of the number of apps.

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