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
|