Randomness Probability

If you roll one die, what is the probability of getting an odd number or a 4?

• 2/3

• 1/3

• 1/2

• 1/6

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

• 1/2

• 13/20

• 21/20

• 4/5

How could you simulate randomly choosing a place for lunch out of 6 different restaurants?

• flip a coin

• roll a die

• spin a 4-sided spinner

• flip 2 coins

You have a sack with 3 red marbles, 1 white marble, 5 blue marbles, 6 green marbles, and 3 orange marbles. What is the probability that you draw a blue or green marble?

• 30/324

• 1/9

• 11/18

• 11/324

To find the probability of an event NOT occurring, what rule do we use?

• The Addition Rule

• The Subtraction Rule

• The Complement Rule

• The Multiplication Rule for Independent Events

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

An event has a 1/4 chance of occurring. What is the chance of it not occurring?

• 3/4

• 1/4

• Can't find with this information

• .14

Event A has a 5% chance of occurring, what is the chance of it NOT occurring?

• 50%

• 95%

• 90%

• 15%

To find the probability of Event A OR Event B happening, what rule do we use?

• Addition Rule

• Multiplication Rule

• Complement Rule

• Subtraction Rule

• Yes, because all of the probabilities are between 0 and 1 inclusive and the sum of all the probabilities is 1.
• No, all probabilities are not be between 0 and 1 inclusive
• No, the sum of all the probabilities is not 1.
• Yes, because the distribution is symmetric