Jamie has a deck of 60 sports cards, of which some are baseball cards and some are football cards. Jamie pulls out a card randomly from the deck, records its type, and replaces it in the deck. Jamie has already recorded nine baseball cards and 11 football cards. Based on these data, what is, most likely, the number of baseball cards in the deck?
20
22
25
27

Question

Jamie has a deck of 60 sports cards, of which some are baseball cards and some are football cards. Jamie pulls out a card randomly from the deck, records its type, and replaces it in the deck. Jamie has already recorded nine baseball cards and 11 football cards. Based on these data, what is, most likely, the number of baseball cards in the deck?
20
22
25
27

mathngn · Answer

@skullpatrol

mathngn · Answer

@Directrix

directrix · Answer

Jamie has seen 20 of the 60 cards. 
Note that 60 = 3*20

Of the 20 cards, Jamie saw 9 are baseball cards.

If 9 cards out of 20 randomly chosen cards are baseball cards, then expect (don't know for sure) 3*9 = 27 cards in the deck of 60 to be baseball cards.

@mathngn

directrix · Answer

@mathngn   When you post a question, try to stay alive on OpenStudy with the question until help comes. Thanks.