1. A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 72 and a standard deviation of 7.

2. A study indicates that 18- to 24- year olds spend a mean of 145 minutes watching video on their smartphones per month. Assume that the amount of time watching video on a smartphone per month is normally distributed and that the standard deviation is 15 minutes

3. In 2008, the per capita consumption of soft drinks in Country A was reported to be 19.37 gallons. Assume that the per capita consumption of soft drinks in Country A is approximately normally distributed, with a mean of 19.37 gallons and a standard deviation of 4 gallons.

1. b. The probability is 25% that a student taking the test scores higher than what grade?

2. c. What is the probability that an 18- to 24-year-old spends more than 155 minutes watching video on his or her smartphone per month?

3. c. What is the probability that someone in Country A consumed less than 10 gallons of soft drinks in 2008