Probability - Addition Rule

A day of the week is chosen at random. What is the probability of choosing a Monday or Tuesday?

• 1/7

• 2/14

• 2/7

• None of the above

In a pet store, there are 6 puppies, 4 gerbils, and 7 parakeets. If a pet is chosen at random, what is the probability of choosing a puppy or a parakeet?

• 11/17

• 13/17

• 10/17

• None of the above

A number from 1 to 10 is chosen at random. What is the probability of choosing a 5 or an even number?

• 3/5

• 1/2

• 1/5

• None of the above

A spinner has 4 equal sectors colored yellow, blue, green, and red. What is the probability of landing on red or blue after spinning this spinner?

• 1/4

• 1/2

• 3/4

• None of the above

A glass jar contains 1 red, 3 green, 2 blue, and 4 yellow marbles. If a single marble is chosen at random from the jar, what is the probability that it is yellow or green?

• 3/10

• 4/10

• 7/10

• None of the above

A single card is chosen at random from a standard deck of 52 playing cards. What is the probability of choosing a red king or a club?

• 15/52

• 16/52

• 17/52

• None of the above

On New Year's Eve, the probability of a person having a car accident is 0.09. The probability of a person driving while intoxicated is 0.32 and probability of a person having a car accident while intoxicated is 0.15. What is the probability of a person driving while intoxicated or having a car accident?

• 0.32

• 0.09

• 0.15

• 0.26

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

If you roll one die, what is the probability of getting an even number or a multiple of 3?

• 1/3
• 2/3
• 1/2
• 1/6

A single 6-sided die is rolled. What is the probability of rolling an even number or a number less than 3?

Match the individual parts of the solution.

• Final Probability as a fraction

• Sample Space "less than 3"

• Sample Space "even number"

• {2, 4, 6}

• Adding the Probabilities

• {1, 2}

• Not Mutually Exclusive Probability:

  P(A)+P(B)-P(both)