Please help me with where i missed points

Assignment

The performance of 20 students on their final exam on statistics in 1992 and for the second class of 20 students in 2017 is shown in the table below.

Scores on statistics final exam, 1992 and 2017

Class of 1992	Class of 2017
80	100
91	99
91	94
80	94
74	94
74	88
73	88
75	81
76	88
73	89
73	80
69	88
67	76
68	75
68	63
68	61
68	53
57	55
58	56
59	82

Use the data to answer the following questions. NOTE: You may need to use the z-score table located in Appendix A of the text (p. 697)

1. Find the mean and standard deviation for the final exam scores in the two years, 1992 and 2017.
2. Suppose you scored an 85 on this exam. In which distribution is your test score the farthest above the mean? How far above the mean is your score in both of these distributions?
3. Admission to a (paid) summer internship program requires that students earn a C or better (70% or higher) on their statistics final exam. If we assume that scores (in both years) on this test are reasonably normally distributed, what percentage of students in 1992 and 2017 would qualify for this internship?