44
CHAPTER 2. DESCRIPTIVE STATISTICS
The next two questions refer to the following histogram.
Frederico recently opened a "designer" Tshirt
store near the beach. During the first month of operation, he conducted a marketing survey of a random
sample of 111 customers. One of the questions asked the customer how many Tshirts he/she owns that
cost more than $19 each.
Exercise 2.29
(Solution on p. 48.)
The percent of people that own at most three (3) Tshirts costing more than $19 each is approxi
mately:
A.
21
B.
59
C.
41
D.
Cannot be determined
Exercise 2.30
(Solution on p. 48.)
If the data were collected by asking the first 111 people who entered the store, then the type of
sampling is:
A.
cluster
B.
simple random
C.
stratified
D.
convenience
Exercise 2.31
(Solution on p. 48.)
A music school has budgeted to purchase 3 musical instruments. They plan to purchase a piano
costing $3000, a guitar costing $550, and a drum set costing $600. The average cost for a piano is
$4,000 with a standard deviation of $2,500. The average cost for a guitar is $500 with a standard
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deviation of $200. The average cost for drums is $700 with a standard deviation of $100. Which
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 Fall '08
 Ripol
 Statistics, Standard Deviation, Mean

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