Conditional Probability

[ragemp]

Can someone please explain how to calculate this to me?

What is the conditional probability that a card drawn at random from a pack of 52 cards is a face card, given that the drawn card is a spade?

What is the probability that a card drawn at random from a pack of 52 cards is either a spade or a face card?

 

[arthur ohlsten]

knowing you have a spade , you have 1 of 13 possible cards
of these 13 possible cards 3 are face cards

probability = 3/13 answer
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Probability that a card is a spade[13 cards] or a non spade face card[9]

cards that satisfy= 22 cards
total cards 52

Probability= 22/52 answer

Arthur