AP EAMCET Engineering 2013 Solved Paper

Section: Mathematics

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Question : 120 of 160

Marks: +1, -0

The random variable takes the values 1,2,3, .....,m. If P(X=n)=

1

m

to each n, then the variance of X is

(m+1)(2m+1)
6
m2−1
12
m+1
2
m2+1
12

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