Stat 21  Ibser  Quiz 1  Feb 2, 2009
This quiz should be handed in during your section either Monday Feb 9 or Tuesday Feb
10. Your quiz will be scored for your own feedback, but you will get full points if you
simply answer every question. In order to prepare you for the midterm, I recommend that
you take this quiz in 45 minutes without using the book, notes, or anyone else’s brain.
You should use a calculator and normal curve, but show work, as you will have to on the
midterm. This quiz covers Ch 35 of the text. You don’t have to hand in the questions,
just the answers.
1. 50 students took a test, and the table shows their scores. For all parts of this problem,
assume that the scores are continuous and that they are evenly distributed within each
separate class interval.
Score
1030
3050
5060
6070
7080
8090
90100
Count
4
6
5
8
10
11
6
(a) Draw a histogram for this data.
(b) In what interval will you find the median value?
(c) If possible, identify the exact value of the median. If not possible, explain why not.
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 Spring '09
 IBSER
 Statistics, Normal Distribution, Standard Deviation, median 70th percentile

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