• Jun 3rd 2010, 11:18 PM
alanpaul
There are some cards with pictures of objects on. There are 13 mice, 4 monkeys, 4 roses,2 oak trees and 7 hen cards. When you pick a card, what is the probability of picking ananimal?

Choose TWO letters for the answer:

(A) You have an even chance.
(B) You have a greater than even chance.
(C) Less than 1%
(D) 100%
(E) 0
(F) 3/4
(G) 4/5
(H) 2/3
(I) 1/5
(J) 0.5

With thanks
Alan
• Jun 3rd 2010, 11:43 PM
CaptainBlack
Quote:

Originally Posted by alanpaul
There are some cards with pictures of objects on. There are 13 mice, 4 monkeys, 4 roses,2 oak trees and 7 hen cards. When you pick a card, what is the probability of picking ananimal?

Choose TWO letters for the answer:

(A) You have an even chance.
(B) You have a greater than even chance.
(C) Less than 1%
(D) 100%
(E) 0
(F) 3/4
(G) 4/5
(H) 2/3
(I) 1/5
(J) 0.5

With thanks
Alan

With equally likely outcomes the probability is the ratio of favourable cases to the total number of outcomes.

Here the question is ambiguous to some extent since I suspect that you are not supposed to consider hens as animals.

So the probability is the number of animal cards divided by the total number of cards.

CB