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Math 140: Statistics, April 8, 2008
Quiz 13, Chapters 18 & 19
1. (6 pts.) This is from Figure 7 on page 321 of your text.
It is for the sum of fifty draws from a box:
a) The shaded area represents the probability the total will be between __________
and __________ inclusive.
b) On the above figure, carefully shade the area that represents the probability the
total will be between 105 and 110 exclusive.
2. (10 pts.) If you flip a fair coin 900 times, what is the probability that you get more
than 430 heads inclusive? Show your work clearly labeling intermediate values.
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