A fast-food restaurant monitors its drive-thru service times electronically to ensure that its speed of service is

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A fast-food restaurant monitors its drive-thru service times electronically to ensure that its speed of service is meeting the company’s goals. A sample of 28 drive-thru times was recently taken and is shown here.

Speed of Service (Time in Seconds)
83 138 145 147 130 79 156 156 90 85 68 93 178 76 73 119 92 146 88 103 116 134 162 71 181 110 105 74

a. Construct a stem and leaf diagram of the speed of service times.

b. What range of time might the restaurant say is the most frequent speed of service?

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