試題詳解

89. Let N₁ and N₂ represent the numbers of claims submitted to a life insurance company in April and May, respectively. The joint probability function of N₁ and N₂ is
 
 Calculate the expected number of claims that will be submitted to the company in May, given that exactly 2 claims were submitted in April.
(A)
(B)
(C)
(D)e² −1
(E)e²