explain 19, 21, & 23

19. The following table shows four rows from a frequency 22. The following table shows four rows from a frequency distribution table for a sample of n = 25 scores. Use distribution table for a sample of n = 20 scores. Use interpolation to find the percentiles and percentile interpolation to find the percentiles and percentile ranks requested; ranks requested: CF C% 0% X f 20 100 18 72 40-49 16 15 60 30-39 9 45 9 36 20-29 25 16 10-19 a. What is the percentile rank for X = 6? a. Find the 30th percentile b. What is the percentile rank for X = 7? b. Find the 52nd percentile. c. What is the 20th percentile? c. What is the percentile rank for X = 46? d. What is the 66th percentile? d. What is the percentile rank for X = 21? 20. The following table shows four rows from a frequency 23. Construct a stem and leaf display for the data in prob- distribution table for a sample of # - 50 scores. Use lem 5 using one stem for the scores in the 50s, one for interpolation to find the percentiles and percentile scores in the 40s, and so on. ranks requested; 24. A set of scores has been organized into the following X f C% stem and leaf display. For this set of scores: 15 5 32 64 a. How many scores are in the 70s? 14 8 27 54 b. Identify the individual scores in the 70s, 13 c. How many scores are in the 40s? 6 19 38 d. Identify the individual scores in the 40s. 12 13 26 4 8 a. What is the percentile rank for X = 13? 5 421 b. What is the percentile rank for X - 15? c. What is the 50" percentile? 6 3824 d. What is the 60" percentile? 7 592374 21. The following table shows four rows from a frequency 8 24316 distribution table for a sample of > = 50 scores. Use | 275 interpolation to find the percentiles and percentile ranks requested: 25. Use a stem and leaf display to organize the following distribution of scores. Use six stems with each stem X f C% corresponding to a 10-point interval. 15-19 3 50 Scores: 10-14 47 36. 47, 14, 19, 65 5-9 8 82 52. 47. 42. 11. 25 18 33 66 28. 39, 32. 34, 58 a. What is the percentile rank for X - 17? 57, 22. 49, 22, 16 b. What is the percentile rank for X = 6? 33. 137. 23. 55, 44 c. What is the 70th percentile? d. What is the 90th percentile