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Question

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 calls01234567
Frequency1421254351403912
What is the median of the distribution ?

A
3.5
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B
4
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C
4.5
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D
5
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Solution

The correct option is A 3.5
Here the No.of calls are 0,1,2,3,4,5,6,7

First we should Place the data in ascending order (smallest to highest).
Here it is already in ascending order,

Now Add the two middle numbers and then divide by two, to get the average

(3+4)2=3.5
Hence The median is 3.5.

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