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Question

Find the mean of the following 10 observations:
23,22,22,5,5,20,20,20,23,22.

A
14.5
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B
18.2
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C
16.5
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D
7.6
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Solution

The correct option is B 18.2
The frequency table of the above observations can be obtained as below:

XifiXifi
5210
20360
22366
23246
Σfi=10 Σfixi=182

We know, Mean is given by,

Mean=ΣfixiΣfi=18210=18.2.

Thus, option B is correct.

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