Question

If 2 cards are drawn from a deck of 52 cards, what is the expected number of spades?

Answer 1

A. 0.75

B. 0.25

C. 0.50

D. 0.47

Answer 2

C

Answer 3

0 spades - 39/52*38/51
1 spade - 2*13/52*39/51
2 spade - 13/52*12/51

Expected number shall be
0*P(0)+1*P(1)+2*P(2)
This gives 0.5