填空题 .The numbers of passengers on 9 airline flights were 22, 33, 21, 28, 22, 31, 44, 50, and 19. The standard deviation of these 9 numbers is approximately equal to 10.22.

填空题 2.  Find the mean, median, mode, range, and interquartile range of the 9 numbers.

填空题 3.  If each flight had had 3 times as many passengers, what would have been the mean, median, mode, range, interquartile range, and standard deviation of the 9 numbers?

填空题 4.  If each flight had had 2 fewer passengers, what would have been the interquartile range and standard deviation of the 9 numbers?