37.   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	Â

 

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.