Compound Probability and Venn Diagrams

A box contains 3 brand A batteries and 7 brand B batteries. 30% of brand A batteries are faulty and 40% of brand B batteries are faulty. A battery is selected at random and then checked to see if it is faulty. What is the probability that a faulty brand B battery is selected?

• 0.28

• 1/4

• 0.42

• 0.21

A box contains 3 brand A batteries and 7 brand B batteries. 30% of brand A batteries are faulty and 40% of brand B batteries are faulty. A battery is selected at random and then checked to see if it is faulty. What is the probability that a not faulty brand A battery is selected?

• 0.21

• 0.09

• 0.28

• 0.25

How many senior boys play football and wrestle?

• 9

• 12

• 18

• 39

What is the probability Simeon does not do sport if you know he does do a foreign language?

• 23/37

• 14/23

• 14/37

• 3/23

Tags

Venn Probability Hard

What is P(not B | A or C)?

• 3/7

• 4/9

• 13/21

• 8/21

What is P(Foreign language | Sport)? (Remember to reduce the fraction!)

• 14/27

• 7/12

• 23/47

• 37/47

What is P(not B | not A)?

• 2/9

• 1/2

• 13/18

• 9/13

What is P(A or B | C)?

• 5/8

• 5/16

• 4/5

• 11/16

How many students do not snowboard?

• 21

• 22

• 28

• 29

Identify the shaded area...

• A

• B

• A'

• B'