For the next three (03) items that follow :
The number of telephone calls received in 245 successive one minute intervals at an exchange is given below in the following frequency distribution.

Number of calls	0	1	2	3	4	5	6	7
Frequency	14	21	25	43	51	40	39	12

What is the mode of the distribution ?

The number of telephone calls received at an exchange in 245 successive one-minute intervals are shown in the following frequency distribution :

$\begin{array}{ccccccccc}\text{Number of calls}& 0& 1& 2& 3& 4& 5& 6& 7\\ \text{Frequency}& 14& 21& 25& 43& 51& 40& 39& 12\end{array}$

Compute the mean deviation about median.

The number ot telephone calls received at an exchange per interval for 250 successive one-minute intervals are given in the following frequency table:
No. of calls (x) : 0 1 2 3 4 5 6
No. of intervals (f) : 15 24 19 46 54 43 39
Compute the mean number of calls per interval.