A researcher studying undergraduate sleep conducts a survey on all 6003 undergraduate students at the University and finds that the amount of sleep they get per night is normally distributed, with a mean of 6.9 hours, and a standard deviation of 1.9 hours. a. What percentage of students would be expected to get between 6.9 and 8.0 hours of sleep? Hint: 8.0 hours is less than 1 standard deviation above the mean b. If the recommended amount of sleep per night is 7.5 hours, what percentage of students are not getting enough sleep? c. If an undergraduate is at the 35th percentile for sleep, how many hours per night are they sleeping?