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Question

The mean of the following distribution is:
xi10131619fi2576 

 



Your Answer
A

15.2

Your Answer
B

15.35

Correct Answer
C

15.55

Your Answer
D

16


Solution

The correct option is C

15.55


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

xi10131619fi2576xifi2065112114
mean=xififi

xifi=20+65+112+114=311
 
 fi=20


Hence,  mean=xififi=31120=15.55

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