Addition Rule Probability

Which of the following shows how to determine P(skateboard or rollerblades)?

• 48/100 + 42/100 - 39/100

• 39/100 + 3/100 - 49/100

• 49/100 + 9/100 - 3/100

• 9/100 + 3/100 - 39/100

find the probability of choosing a student at random that plays an instrument OR a sport

• 1/2

• 13/20

• 21/20

• 4/5

Which of the following shows how to determine P(packers or male)?

• 75/150 + 90/150 - 50/150

• 75/150 + 35/150 - 25/150

• 50/150 + 40/150 + 25/150

• 90/150 + 50/150 - 75/150

• A

• B

• C

• D

• A

• B

• C

• D

Joe has a number cube with sides labeled 1 through 6. He rolls the number cube twice. What is the probability that the sum of the two rolls is greater than 8 or at least one of the rolls is a 5?

• 0.58

• 0.44

• 0.75

• 0.66

The outcomes for rolling two number cubes numbered 1 through 6 are shown above. What is the probability the sum of the number cubes will be 7 or 4?

If P(A) = 0.24, P(B) = 0.41, and P(A and B) = 0.18, what is P(A or B)?

• 0.17

• 0.47

• 0.59

• 0.65

If P(A)= 0.2, P(B)=0.3 and P(A and B)=0.06, what is P(A or B)?

Round to the nearest hundredths (two AFTER the decimal)

If P(A)= 0.4, P(B)=0.23 and P(A and B)=0.15, what is P(A or B)?

Round to the nearest hundredths (two AFTER the decimal)