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Math 140: Statistics, Feburary 14, 2008
Quiz 3, Chapter 4
1. (9 pts.) For the following data: 2, 4, 5, 6, 8
a) What is the mean?
b) What is the median?
c) What is the standard deviation?
2. (6 pts.) For a basketball league, you are told the average height for a player is 76
inches with a standard deviation of 3 inches.
a) What percentage of players would you expect to have a height between 73 and 79
inches?
b) What percentage of players would you expect to be over 82 inches tall?
3. (2 pts.) If a histogram has a long right hand tail, which would you expect to be larger,
the mean or the median?
4. (2 pts.) In a history class, the first quiz of the semester had an average score of 80
with an SD of 10. The second quiz had an average score of 84 and an SD of 2. On
which quiz would you expect more scores of 90 or better? Why?
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