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How many apps? According to a website, the mean number of apps on a smartphone in the United States is 82. Assume the number

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How many apps? According to a website, the mean number of apps on a smartphone in the United States is 82. Assume the number of apps is normally distributed with mean 82 and standard deviation 23. Part: 0 / 2 Part 1 of 2 (a) What proportion of phones have between 66 and 75 apps? Round the answer to four decimal places. The proportion of phones that have between 66 and 75 apps is x

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