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:

$142 $85 $139 $161 $175 $85 $133 $149 $145 126 315 244 132 172 149 166 214 105 220 126 90 171 162 229 121 118 149 126 128 118 172 156 214 87 172 327 162 195 128 126 142 118 127 128

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Required: a. Arrive at a suggested class interval. (Round your answer up to the next multiple of 5.)

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