The time to wait at the dentist's office is normally distributed with an average of 15 minutes and a standard deviation of 2.5 minutes. What is the percent of people that wait between 12.5 - 17.5 minutes?

Group of answer choices

50%

95%

99.7%

68%

Question 15

The average time spent on the phone in a day is 180 minutes with a standard deviation of 20 minutes. What is the z-score for a person who spends 165 minutes on the phone?

Group of answer choices

-0.75

156

0.75

160