Question: Apps not working on smartphone. In a Pew Research Center survey titled U.S. Smartphone Use in 2015, more than 2,000 smartphone users were asked how

Apps not working on smartphone. In a Pew Research Center survey titled U.S. Smartphone Use in 2015, more than 2,000 smartphone users were asked how often the applications (apps) they downloaded on their cell phones were not working correctly. Responses were recorded as follows: 1 = Frequently, 2 = Occasionally, 3 = Rarely, and 4 = Never. The probability distribution for the numerical response, x, is provided in the table.

a. Verify that the properties of a probability distribution for a discrete random variable are satisfied.

b. Find P(x > 2).

c. Find E(x). Interpret this value, practically.

Response, x Probability, p(x) 1 (Frequently) 2 (Occasionally) 3 (Rarely) 4 (Never) .10 39 40 .11

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