Question

A 2011 analysis performed by Read Write Mobile revealed that the average number of apps downloaded per day per iOS device (such as iPhone, iPod, and iPad) exceeds 60 (www.readwriteweb.com/ mobile/2011/01/more-than-60-apps-downloaded-per-ios-device.php). Suppose that the current distribution of apps downloaded per day per iOS device is approximately normal with a mean of 65 and a standard deviation of 19.4. Find the probability that the number of apps downloaded on a randomly selected day by a randomly selected owner of an iOS device is
a. 100 or more
b. 45 or fewer


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  • CreatedAugust 25, 2015
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