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Question

The mean of the following distribution is:
xi10131619fi2576


A

15.2

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B

15.35

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C

15.55

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D

16

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Solution

The correct option is C

15.55


We know that,
Average or mean value of a given number of observations is the sum of all the observations divided by the total number of observations.

Mean=xififi

Now,
xifi=20+65+112+114=311

fi=20

So,
Mean=xififi=31120=15.55


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