Chapter 3
1
.
(Hypothetical.) In a sample of families in a certain town, a histogram for the distribution of
incomes is shown below.
a) Are there more families with incomes between $20,000 and $30,000 or between
$30,000 and $40,000?
b) Are there more families with incomes between $20,000 and $30,000 or between
$30,000 and $50,000?
c) About what percentage of the families have incomes between $17,000 and $18,000?
2. In a college statistics class, the final exam scores were distributed as follows:
Score
Count
010
5
1050
8
5060
0
6070
7
7080
15
8090
24
90100
22
Assume that for each class interval, the left end point falls in that class interval.
a)
Draw a relative frequency histogram for the data.
b) If it took an 80% to make a B on the final, what percentage of the class made B’s or
better?
c) Give a possible explanation for the small rise at the far left of the histogram.
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View Full Document3. (Hypothetical.) The histogram for the distribution of children per family in one town is shown
below.
There were 10,000 families in the town.
a)What percentage of the families have an only child?
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 Spring '08
 Patton
 Statistics, Histogram, relative frequency histogram

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