Conditional Probability

. What is the probability that a student has a brother given that they do not have a sister?

*Write your answer as a fraction*

(a)  

What is the probability that a student plays a sport given that they play an instrument?

*Write your answer as a fraction*

(a)  

What is the probability that a student plays a sport or that they play an instrument?

*Write your answer as a fraction*

(a)  

P (Sandals | Pants):

• 4/20

• 6/15

• 7/14

• 4/14

What is P(Foreign language | Sport)?

• 14/27

• 14/24

• 23/47

• 37/47

• 14/50

What is P(Ace given hearts)?

*convert your fraction to a percentage*

• 1.9%

• 7.7%

• 25%

• 6.3%

What is the probability of pulling an even number, given hearts and diamonds?

• 12/26

• 26/52

• 1/2

• 10/20

What is the probability of pulling a King, given spades?

• 1/13

• 1/4

• 1/52

• 4/52

A dice is tossed.

Find P (less than 5 | even number).

• 2/3

• 3/6

• 1/2

• 1/3

A dice is tossed.

Find P(2 | number greater than 3).

• 0

• 1/3

• 1/6

• 1