The distribution of the number of hours of sleep an adult gets on a weekend night is normally distributed with a mean of 6.9 hours It is recommended that adults get between 7 and 9 hours of sleep per night. What proportion of adults get the proper amount of sleep? Dan slept for 6 hours last night; what proportions of adults got more sleep than him? The number of hours Natalie slept last night puts her in the 93rd percentile. How many hours did she sleep?