Kevin Horn is the national sales manager for National Textbooks Inc. He has a sales staff of 40 who visit college professors all over the United States. Each Saturday morning he requires his sales staff to send him a report. This report includes, among other things, the number of professors visited during the previous week. Listed below, ordered from smallest to largest, are the number of visits last week.
|
38
|
40
|
41
|
45
|
48
|
48
|
50
|
50
|
51
|
51
|
52
|
52
|
53
|
54
|
55
|
55
|
55
|
56
|
56
|
57
|
|
59
|
59
|
59
|
62
|
62
|
62
|
63
|
64
|
65
|
66
|
66
|
67
|
67
|
69
|
69
|
71
|
77
|
78
|
79
|
79
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a. Determine the median number of calls.
b. Determine the first and third quartiles.
c. Determine the first decile and the ninth decile.
d. Determine the 33rd percentile.