20-21. The test scores of 10 randomly selected students are listed below. 2 points Find the median. 30 35 43 4 4 47 48 54 56 57 59 * A 47 B. 48 C. 47.5 D. 48.5 22. Given the following stem-and-leaf plot/diagram. The number occurred the 1 point most is * 1 | 03 2 | 2224 3 | 123333 4 | 1156 5 | 3356 6 | 45 713 A 22 O B. 3 O C. 38 O D. 2 23-24. The test scores of 20 students are listed below. Find the 34th 2 points percentile (2 pts)' 36 45 53 56 67 72 80 85 96 A. 59 B. 56 O C. 60 O D. 57 25-26. Refer to the data set 3.94, 1.47, 2.06, 2.36, 3.74, 3.43, 3.78. Find the 2nd 2 points decile. (2 pts)' )A. 1.47 B. 2.06 C. 2.36 D. 3.43 27. What will happen to the mean if each observation is increased to half the 1 point value of the mean? * A The mean will double B. The mean will be the median C. The mean will decrease by half its value D. The mean will increase to half its value 28-29. The coefficient of variation of the height of 20 people selected at 2 points random from a given city is found to be 15%. The weight of the selected group has a mean value 72 kg and a standard deviation 8 kg. The obtained results show that (2 pts) * A the weight is more variable than height. O B. the weight is less variable than height. C. height and weight have the same degree of variation. D. height and weight are independent. 3