Concept explainers
Percentiles. The pth percentile of a sorted data set is a number
Table 17-9
Percentile | Approximate location | Percentile | Approximate location |
99th |
|
1st |
|
95th |
|
5th |
|
90th |
|
10th |
|
80th |
|
20th |
|
75th |
|
25th |
|
70th |
|
30th |
|
60th |
|
40th |
|
50th |
|
In Exercises 67 through 73, you should use the table to make your estimates.
Consider again the college entrance exam discussed in Exercise 68.
a. Mary scored 83 points on the exam. Estimate the percentile in which this score places her.
b. Adam scored 45 points on the exam. Estimate the percentile in which this score places him.
c. If there are 250 students that scored 35 points or less on the exam, estimate the total number of students who took the exam.
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Chapter 17 Solutions
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