The following data represent the number of hours of sleep 16 students in a class got the previous evening: 3.5, 8, 9, 5, 4, 10, 6,5,6,7,7,8, 6, 6.5, 7.7.5, 8.5 Find two simple random samples of size n = 4 students. Compute the sample mean number of hours of sleep for each random sample.