1.

Which of the following is variance of random variable x=x_(i) and P(x=x_(i))=p_(i)

Answer»

<P>`SUM(x_(i).P_(i))`
`sum(x_(i).p_(i))-mu^(2)`
`(sumX_(i).P_(i))-mu^(2)`
`2sum(x_(i)-mu)^(2).P_(i)`

ANSWER :B


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