According to a website, the mean number of apps on a smartphone in the United States is  90. Assume the number of apps is normally distributed with mean  90 and standard deviation 30 . Part: 0 / 2 0 of 2 Parts Complete   Part 1 of 2     (a) What proportion of phones have between  30  and  150  apps? Round the answer to four decimal places. The proportion of phones that have between  30  and  150  apps is    .

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