According to eMarketer, adults in the United States spent an average of

92

minutes per day on social media platforms Facebook, Snapchat, and Instagram in 2017. Assume that minutes per day on these platforms follow a normal distribution with a standard deviation of

27.

Complete parts a through d.

Click here to view page 1 of the standard normal distribution table.

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Click here to view page 2 of the standard normal distribution table.

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Question content area bottom

Part 1

a. What is the probability that the amount of time spent today on social media platforms by a particular U.S. adult is less than

70

minutes?

The probability is

.

(Round to four decimal places as needed.)

Part 2

b. What is the probability that the amount of time spent today on social media platforms by a particular U.S. adult is more than

65

minutes?

The probability is

.

(Round to four decimal places as needed.)

Part 3

c. What is the probability that the amount of time spent today on social media platforms by a particular U.S. adult is between

85

and

110

minutes?

The probability is

.

(Round to four decimal places as needed.)

Part 4

d. Which number of minutes per day represents the

65th

percentile?

minute(s) per day

(Round to the nearest whole number as needed.)