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How do you determine mean service time in Excel for a fast-food establishment?

The manager of a fast-food establishment periodically monitors various aspects of its operations, including service time, i.e., the time (in seconds) between placing and receiving an order. Below are the service times for a sample of 48 recent drive-through customers.

84 78 76 95 84 101 91 78
121 99 104 95 74 87 84 96
87 109 58 91 92 72 96 109
76 79 108 72 87 67 75 69
79 111 72 76 75 86 68 74
101 87 111 103 120 57 97 86

I have to determine each of the following measures for the sample of service times by using the appropriate Excel function, which is what I am not really sure about. I have to place the answers in the highlighted cells in Excel:

(a) mean service time
(b) median service time
(d) variance in the service times
(e) standard deviation in the service times.

(Please see attached file)

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Solution Summary

The following posting helps with problems involving Excel functions. Concept covered include mean service time, media service time, variance in service times and standard deviation in service times. A complete, neat and step-by-step solution is provided in the attached Excel file.

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