41.

ViI
C
<
J
Tj
-S?
't oto

2

500

400

Causal; the amount

of sales is related to

earnings.

Lesson Check

10 20 30 40 50

Products Sold

Lesson 12-2

Go t It?

1. Answers may vary. Sample:

pp. 732-737

s

Home Runs

\

Frequency

2-6 4

7-11 5

12-16^4

17-21 1

V

2. Answers may vary. Sample:
   Finishing Times

(^6) r
c 55 4
§- 3S! 2
u_ Z
1
0
& W

# 4

Time (s)
3a. Dollars Spent on Lunch
U^5
C 074
(^33)
LUOJ^7
1
0
uniform
b. Answers may vary.
Sample: $70 for the
week; the data are fairly
uniform, so on average
he spends about $10
per day.
Amount Spent ($)
4.
Interval Frequency
Cumulative
Frequency
0-4 6 6
5-9 4 10
10-14 4 14
15-19 2 16
J
Battery Life
Hours Frequency
9-12 7
13-16 2
17-20 1
21-24 2
k J

2. Battery Life

Hours

Battery Life

Hours Frequency

N

Cumulative

Frequency

[ 9-12 7 7 )

[ 13-16 (^29) )
[ 17-20 1 10 ]
( 21-24 (^212) ]
V

4. The store owner could look at the frequency column to
   pick out the busiest hours. 5. A symmetric histogram has
   roughly the same shape if you fold it down the middle. A
   skewed histogram has a peak that is not in the center.
   6. Add the frequency of each interval to the frequencies
   of all the previous intervals.
   Ex e r c i se s
   7. Answers may vary. Sample:
   Wing Spans
   Number of
   Centimeters

N

Frequency

125-134 5

135-144 4

145-154 4

J

9. Answers may vary. Sample:
   Top Speeds
   Miles per
   Hour Frequency
   90-109 4
   110-129 4
   130-149^2
   150-169 3
   J