A chain of sport shops catering to beginning skiers, headquartered in Aspen, Colorado, plans to conduct a study of how much a beginning skier spends on his or her initial purchase of equipment and supplies. Based on these figures, it wants to explore the possibility of offering combinations, such as a pair of boots and a pair of skis, to induce customers to buy more. A sample of cash register receipts revealed these initial purchases:
|
$140
|
$ 82
|
$265
|
$168
|
$ 90
|
$114
|
$172
|
$230
|
$142
|
|
86
|
125
|
235
|
212
|
171
|
149
|
156
|
162
|
118
|
|
139
|
149
|
132
|
105
|
162
|
126
|
216
|
195
|
127
|
|
161
|
135
|
172
|
220
|
229
|
129
|
87
|
128
|
126
|
|
175
|
127
|
149
|
126
|
121
|
118
|
172
|
126
|
|
a. Arrive at a suggested class interval. Use six classes, and let the lower limit of the first class be $70.
b. What would be a better class interval?
c. Organize the data into a frequency distribution using a lower limit of $80.
d. Interpret your findings.