How many apps? According to a website, the mean number of apps on a smartphone in the United States is 87. Assume the number of apps is normally distributed with mean 87 and standard deviation 28. Part: 0 / 2 Part 1 of 2 (a) What proportion of phones have between 109 and 127 apps? Round the answer to four decimal places. The proportion of phones that have between 109 and 127 apps is Part: 1/ 2 Part 2 of 2 (b) Find the 90" percentile of the number of apps. Round the answer to two decimal places. The 90th percentile of the number of apps is

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