Chapter 18 Answers p.1
Chapter 18: 4, 6, 10
Problems
4.
The candy company claims that 10% of the M&M’s it produces are green.
Suppose that the
candies are packaged at random in large bags containing 200 M&M’s each.
A class of elementary
school students who are learning about percents opens several bags, counts the various colors of
the candies, and calculates the proportion that are green.
a.
Explain why it is appropriate to use a Normal model to describe the distribution of the
b.
Use the 689599.7 Rule to describe how this proportion might vary from bag to bag.
c.
How would this model change if the bags contained even more candies?
6.
in the bag were green.
Is this an unusually large proportion of green M&M’s?
Explain your
reasoning.
500 candies, in order to figure out how unusual it is.)
10.
Assuming that 30% of the students at a university wear contact lenses.
a.
We randomly pick 100 students. Let
p
ˆ
represent the proportion of students in this sample
who wear contacts.
Is the Normal approximation appropriate to use to calculate the
probability that more than 33% of the sample will wear contact lenses?
If the conditions
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 Spring '08
 Hardy
 Statistics, Normal Distribution, Standard Deviation, M&M

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