Question

form 5 cards, 10 ♦,4 ♦, 2 ♦, and 3 ♠, randomly select a card.
A) what is the probability that the selected card is larger than 5 ?
B)what is the probability that the selected card is larger than 5 knowing that the card is red ?

Answer 1

What is the fifth card, or is it not given?

Answer 2

9 ♠

Answer 3

Alright.
A) The probability that the card is larger than 5 is 2/5, because we have two cards larger than 5 out of our set of cards.
B) If we know our card is red, the probability of the card being larger than five is 1/3, because only 1 red card out of 3 red cards is larger than five.
(These convert to 40% and 33.3%, if you need them as percent chances and not ratios.)