Questions
The mean deviation of the series about the mean is
a
n+12n+1
b
n(n+1)d2n+1
c
(n+2)d2n
d
(n-1)d2n+1
detailed solution
Correct option is B
The mean of the given series is a+nd. ∴ Mean deviation about mean =1(2n+1)∑r=02n |(a+rd)−(a+nd)|=d2n+1∑r=02n |r−n|=2d2n+1∑r=1n r=2d2n+1×n(n+1)2=n(n+1)d2n+1Talk to our academic expert!
Similar Questions
Following are the marks obtained by 9 students in a mathematics test:
50, 69,20,33, 53,39, 40, 65, 59
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