1. Consider a sample with data values of 10, 20, 12, 17, and 16. Compute the mean and median. 2. Consider a sample with data values of 10, 20, 21, 17, 16, and 12. Compute the mean and median. 3. Consider a sample with data values of 27, 25, 20, 15, 30, 34, 28, and 25. Compute the 20th, 25th, 65th, and 75th percentiles. 4. Consider a sample with data values of 53, 55, 70, 58, 64, 57, 53, 69, 57, 68, and 53. Compute the mean, median, and mode.