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Bidwell Electronics Inc. recently surveyed a sample of employees to determine how far they lived from corporate headquarters. The results are shown below. Compute the mean and the standard deviation.
Distance (miles)
Frequency
M
0 up to 5
4
2.5
5 up to 10
15
7.5
10 up to 15
27
12.5
15 up to 20
18
17.5
20 up to 25
6
22.5
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