13 Probability

Multiple Choice

Which of the following is an example of probability in action?

• Predicting the weather for tomorrow

• Reading a storybook

• Drawing a picture

• Listening to music

Open Ended

Why do you think understanding probability is important in our daily lives?

Multiple Choice

Which of the following best describes the probability of an event that is certain to happen?

• 0

• 0.5

• 1

• 0.25

Multiple Choice

What is the probability of picking a card numbered 3 from a set of cards numbered 1 to 5?

• 1/5

• 2/5

• 1/3

• 3/5

Fill in the Blanks

The probability of picking a green counter from Tom's bag is

.

Multiple Choice

According to the formula for probability, what is the denominator when calculating the probability of an outcome?

• Number of favorable outcomes

• Total number of possible outcomes

• Number of unsuccessful outcomes

• Total number of trials

Open Ended

What do the probabilities of picking a blue counter and a yellow counter from Jem's bag add up to, and what does this mean?

Open Ended

What does random mean in the context of picking a counter from the bag?

Multiple Choice

What is the probability of picking a blue counter from the bag shown?

• 1/5

• 0.2

• 20%

• 1/4

Multiple Choice

What is the probability of picking a green counter from the bag shown?

• 9/10

• 0.9

• 90%

• 1/2

Multiple Choice

What is the probability of picking a yellow counter from the bag shown?

• 6/8 = 3/4

• 0.75

• 75%

• 1/2

Open Ended

Compare the probability of picking a yellow counter from the bag in the left image of slide 4 with the probability of picking a yellow counter from the bag in the right image of slide 4. Which bag gives a higher probability and why?

Multiple Select

Which of the following are correct representations of the probability of picking a yellow counter from the bag in the left image of slide 4?

• 6/8

• 3/4

• 0.75

• 0.4

Fill in the Blanks

The probability of picking a white counter from the bag in the right image of slide 6 is

Multiple Select

Based on the bags of counters shown, which of the following statements are correct?

• The probability of picking a yellow counter from the first bag is 0.75.

• The probability of picking a pink counter from the second bag is 0.2.

• There are more blue counters than pink counters in the second bag.

• The probability of picking a green counter from the first bag is 0.25.

Multiple Choice

Which of the following best describes how to calculate the probability of an outcome?

• Divide the number of ways the outcome can happen by the total number of possible outcomes.

• Multiply the number of ways the outcome can happen by the total number of possible outcomes.

• Add the number of ways the outcome can happen to the total number of possible outcomes.

• Subtract the number of ways the outcome can happen from the total number of possible outcomes.

Open Ended

Explain why it is sometimes easier to keep probabilities as fractions rather than decimals or percentages.

Multiple Choice

If you roll a fair dice, what is the probability of getting a 6?

• 1/6

• 1/2

• 1/3

• 1/4

Multiple Choice

If you pick a counter at random from a bag containing 2 white, 4 black, and 2 yellow counters, what is the probability of picking a black counter?

• 1/2

• 1/4

• 1/3

• 2/3

Fill in the Blanks

If you rolled a fair dice 60 times, you would expect to get

sixes.

Multiple Choice

If the probability of picking a gold coin from a bag is 1/3 and there are 4 gold coins, how many silver coins are there in the bag?

• 2

• 3

• 4

• 8

Fill in the Blanks

This bag contains gold, silver, and copper coins. Half the coins are copper. The probability of picking a silver coin is 1/3. What is the exact probability of picking a gold coin?

Multiple Choice

In a bag, the probability of picking a silver coin is 2/5. If there are 9 silver coins, how many gold coins are there?

• 10

• 5

• 6

• 12

Open Ended

Explain the difference between experimental probability and theoretical probability, using examples from the coin bag scenarios.

Multiple Choice

Which of the following statements is true about the probability of an event?

• A probability of 0.5 means the event is unlikely.

• A probability of 1 means the event is certain.

• A probability of 0 means the event is likely.

• A probability between 0 and 0.5 means the event is certain.

Multiple Choice

Which of the following best describes the probability scale used in mathematics?

• A scale from 1 to 10

• A scale from 0 to 100

• A scale from 0 to 1

• A scale from -1 to 1

Open Ended

After learning about probability, what is one question you still have or something you would like to know more about?

Open Ended

What is one real-life situation where you could use probability to make a decision?