Question

大一高数利用洛必达法则求极限的课后题答案

大一高数利用洛必达法则求极限的课后题答案

Answer 1

: P(X=k) = {(e^(-λ))(λ^k)}/k!, E(X) =λ, D(X) =λ. P(X=1) = {(e^(-λ))(λ^1)}/1! = e^(-λ)λ P(X=2) = {(e^(-λ))(λ^2)}/2! = e^(-λ)(λ^2)/2 P(X=1)=2P(X=2) --> e^(-λ)λ=2e^(-λ)(λ^2)/2 -->ɨ

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