Addition and Multiplication Rule Probability

There are four balls numbered 1, 2, 4, and 8 in a bag. If two balls are taken out at random, find the probability that the sum of the numbers is greater than or equal to 6

• 1/6

• 3/4

• 1/3

• 1/2

What is the probability that an advertising firm selected at random has either an income between 1 million baht to 20 million baht, or an income of 20 million baht or more?

The chair of the board of director says, "There is a 50% chance this company will earn a profit, 30% chance it will break even, and a 20% chance it will lose money next quarter.

Use an addition rule to find the probability that the company will not lose money next quarter.

• P(E) = 0.50

• P(E) = 0.20

• P(E) = 0.70

• P(E) = 0.80

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

What is the Multiplication Rule?

• P(A) ⋅ P(B|A)

• P(A) - P(B)

• P(A) ⋅ P(B)

• P(A) + P(B) - P(A ∩ B)

What is the Multiplication Rule?

• P(A) ⋅ P(B|A)

• P(A) - P(B)

• P(A) ⋅ P(B)

• P(A) + P(B) - P(A ∩ B)

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

The enrollment at Southburg High School is 1400.  Suppose 550 students take French, 700 take algebra, and 400 take both French and algebra.  What is the probability that a student selected randomly takes French or algebra?

• 1250/1400

• 700/1400

• 550/1400

• 17/28

True or False.

"and" relates to the multiplication rule

"or" relates to the addition rule

• True

• False