Which of the following best describes the addition rule of ...

[RRMR]

Which of the following best describes the addition rule of probabilities?
 
  A) P(A  B) = P(A) + P(B)
  B) P(A  B) = P(A) + P(B) - P(A  B)
  C) P(A  B) = P(A) + P(B) + P(A  B)
  D) P(A  B) = P(A) P(B)

Question 2

What is the relative efficiency of Z with respect to Y?
 
  A) 0.50
  B) 0.80
  C) 1.20
  D) 1.50

[al]

Answer to Question 1

B

Answer to Question 2

C

[RRMR]

Gracias!

[cici]

Thanks for the timely response, appreciate it