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 44 cash register receipts revealed these initial purchases:

$ 143	$ 84	$ 139	$ 161	$ 175	$ 84	$ 126	$ 149	$ 140
127	263	232	132	172	149	170	215	105
220	126	90	171	162	229	121	116	149
126	144	118	172	156	215	87	172	230
162	195	128	126	142	118	127	144

a-1. Find the smallest class interval. Use five classes. (Round your answer to 1 decimal place.)

a-2. What would be a better class interval?

b. Organize the data into a frequency distribution using a lower limit of $80.

class	class	frequency
$80	$120