Answers created by Jeronimo

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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^3-3x^2-18x+40#?
  
• What is the limit of #(x^4 + x^5) # as x approaches infinity?
  
• What are the critical values of #f(x)=x-xsqrt(e^x#?