Question:The average of `11` observation is `60`If the average of first five observations is `38`and that of the last five is `56`,then the sixth observation is : 

A `90` 
B `110` 
C `85` 
D `100` 

+ Answer
A 

+ Explanation
Sixth observation 

`= [60 xx 11 - (58 xx 5 + 56 xx 5)]`

`= 90`

+ Report

Irin Moni

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