Question

construct the frequency distribution for drive - through service times for burger king lunches using the accompanying data set. times begin when a vehicle stops at the order window and end when the vehicle leaves the pickup window. lunch times were measured between 11:00 am and 2:00 pm. begin with a lower class limit of 70 seconds and use a class width of 40 seconds. click the icon to view the drive - through service times. construct the frequency distribution service time (seconds) frequency 70 - (type whole numbers.) drive - through service times 116 131 147 120 130 77 136 103 121 146 130 110 140 148 110 208 120 105 79 120 81 145 160 83 100 102 78 224 100 100 76 160 195 253 231 250 192 128 100 84 153 151 145 171 124

Explanation:

Step1: Define class intervals

The first class has a lower - limit of 70 and a class - width of 40. So the class intervals are: 70 - 109, 110 - 149, 150 - 189, 190 - 229, 230 - 269.

Step2: Count frequencies

For the class 70 - 109:
Count the number of data values in the set {116, 131, 147, 120, 130, 77, 136, 103, 121, 146, 130, 110, 140, 148, 110, 208, 120, 105, 79, 120, 81, 145, 160, 83, 100, 102, 78, 224, 100, 100, 76, 160, 195, 253, 231, 250, 192, 128, 100, 84, 153, 151, 145, 171, 124} that fall within this range. The values are 77, 79, 81, 83, 78, 76, 100, 100, 100, 103, 102, 105, 100, 84. The frequency is 13.
For the class 110 - 149:
The values are 116, 131, 147, 120, 130, 136, 121, 146, 130, 110, 140, 148, 110, 120, 145, 120, 128, 145. The frequency is 18.
For the class 150 - 189:
The values are 160, 160, 153, 151, 171. The frequency is 5.
For the class 190 - 229:
The values are 195, 192, 224. The frequency is 3.
For the class 230 - 269:
The values are 253, 231, 250. The frequency is 3.

Answer:

Service Time (seconds)	Frequency
110 - 149	18
150 - 189	5
190 - 229	3
230 - 269	3