The number of 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 29 49 54 43 39

Compute the mean number of calls per intervals.

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Solution

Let the assume mean be.

We know that mean,

Here, we have .

Putting the values in the formula, we get

Hence, the mean number of calls per interval is 3.54.

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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.

Q. For the following frequency table, Find the number of telephone calls received at an exchange per interval for

250

successive one-minute intervals.

No. of calls ( $x$ )	$0$	$1$	$2$	$3$	$4$	$5$	$6$
No. of intervals ( $f$ )	$15$	$24$	$29$	$46$	$54$	$43$	$39$

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

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

Compute the mean deviation about median.

Q. 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 mean of the distribution?

Q. 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 ?

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The number of 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 29 49 54 43 39 Compute the mean number of calls per intervals.

Let the assume mean be. We know that mean, Here, we have . Putting the values in the formula, we get Hence, the mean number of calls per interval is 3.54.

The number of 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 29 49 54 43 39

Compute the mean number of calls per intervals.

Let the assume mean be.

We know that mean,

Here, we have .

Putting the values in the formula, we get

Hence, the mean number of calls per interval is 3.54.