The number of telephone calls received at an exchange in 245 successive one-minute intervals are shown in the following frequency distribution. Compute the mean deviation about the median.
No. of calls |
Frequency |
0 |
14 |
1 |
21 |
2 |
25 |
3 |
43 |
4 |
51 |
5 |
40 |
6 |
39 |
7 |
12 |