P&S End of 9 Weeks Spring-2025

Solving probability problems using addition rule: A bag contains 4 red and 5 blue marbles. What is the probability of drawing a red or a blue marble?

• The probability of drawing a red or a blue marble is 4/9 - 5/9 = -1

• The probability of drawing a red or a blue marble is 4/9 + 5/9 - 0 = 1

• The probability of drawing a red or a blue marble is 4/9 * 5/9 = 20/81

• The probability of drawing a red or a blue marble is 4/9 / 5/9 = 0.8

Events A and B are mutually exclusive. If the probability of event A is 0.4 and the probability of event B is 0.3, what is the probability of A or B occurring?

• 1.0

• 0.5

• 0.7

• 0.2

Solving probability problems using addition rule: In a group of students, 60% like pizza and 40% like burgers. 30% like both pizza and burgers. What is the probability that a student chosen at random likes either pizza or burgers?

• 0.60 - 0.40 = 0.20

• 0.60 x 0.40 = 0.24

• 0.60 / 0.40 = 1.50

• 0.60 + 0.40 - 0.30 = 0.70

If drawing a heart and drawing a spade from a deck of cards are mutually exclusive events, what is the probability of drawing either a heart or a spade?

• 1/3

• 1/2

• 1/4

• 3/4

In a group of students, 30% play basketball, 40% play soccer, and 10% play both basketball and soccer. What is the probability that a student chosen at random plays either basketball or soccer?

• 0.60

• 0.20

• 0.50

• 0.10

In a standard deck of 52 cards there are 13 diamonds and 13 hearts (red) and 13 spades and 13 clubs (black).  Find the probability of choosing a card at random that is a spade OR a 7

• 1/52
• 1/13
• 4/13
• 17/52

The probability of A is given P(A) = .4  and the probability of B is given P(B)=.25.  If the Probability of the intersection (A AND B) is .13, Find the probability of choosing A OR B. Hint - use the addition rule!

• .5
• .78
• .13
• .52

Mrs. Elder has a box containing 6 cracker, 3 peppermints, 6 bubble gums, and 3 licorice sticks. If she randomly chooses one piece from the box, what is the probability that she will grab a cracker or a peppermint?

• peppermint
• 1/6
• 1/2
• 1/3

If a spinner is numbered 1 – 8, when you spin it the events of spinning an even number and a number less than 4 are ...

• Mutually Exclusive

• Not Mutually Exclusive

Which of the following shows how to determine P(shaded number or number less than five)?

• 4/8 + 4/8 - 2/8
• 4/9 + 2/8 - 4/8
• 4/8 + 6/8 + 2/8
• 2/8 + 4/8 - 4/8