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If a variable takes values 0,1,2,3,........

If a variable takes values `0,1,2,3,`.......... with frequencies proportional to `e^-lambda,e^-lambda lambda,(e^-lambda lambda^2)/(2!),(e^-lambda lambda^3)/(3!),.....` then the mean of the distribution is

A

`e^(-lambda) `

B

` lambda`

C

` e^(-lambda) lambda `

D

`((1)/(2)) e^(-lambda) lambda^(2) `

Text Solution

Verified by Experts

The correct Answer is:
B
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