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Median and Percentile

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 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

1. Determine the median number of calls.
2. Determine the first and third quartiles.
3. Determine the first decile and the ninth decile.
4. Determine the 33rd percentile
A study is made by the recording industry in the United States of the number of music CDs owned by senior citizens and young adults. The information is reported below.
Seniors
28 35 41 48 52 81 97 98 98 99
118 132 133 140 145 147 153 158 162 174
177 180 180 187 188

Young Adults

81 107 113 14 7 147 175 183 192 202 209
233 251 154 166 283 184 184 316 372 401
417 423 490 500 507 518 550 557 590 594

1. Find the median and the first and third quartiles for the number of CDs owned by senior citizens. Develop a box plot for the information.
2. Find the median and the first and third quartiles for the number of CDs owned by young adults. Develop a box plot for the information.
3. Compare the number of CDs owned by the two groups.

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