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If x~P(λ) show that var(x)= λ without using moment generating function of X ?

What is the formula for the standard error?

How do you find the critical points of #k'(x)=x^33x^218x+40#?

What is the limit of #(x^4 + x^5) # as x approaches infinity?

What are the critical values of #f(x)=xxsqrt(e^x#?