Question

f(2)=3f(4) then variance of x is

Answer 1

Answer:

Explanation:

Poisson's distribution implies

P(X=n)= λ  n e  −λ / n!

Where mean=variance=λ

Hence P(x=2)=3P(x=3)

3 whole  λ  3  e  −λ / 3! =  λ  2  e  −λ / 2!

 ​3λ=3

λ=1

Hence mean=variance=1

 

 

 

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