Understanding Probability

What is the probability of flipping heads with a fair coin?

• 1/4

• 1/2

• 1/3

• 3/4

What does a probability of 1 indicate?

• The event is impossible

• The event is unlikely

• The event is certain to happen

• The event has a 50% chance of happening

What does a probability less than one-half indicate?

• The event is impossible

• The event is certain

• The event is likely

• The event is unlikely

How is probability commonly expressed besides fractions?

• Exponents

• Square roots

• Integers

• Decimals and percentages

What is the probability of rolling a 3 on a standard die?

• 1/3

• 1/2

• 1/4

• 1/6

Why might results from a small number of trials not match expected probabilities?

• All trials are biased

• Due to calculation errors

• Randomness leads to unpredictable short-term results

• Because of the law of averages

How can you increase the accuracy of experimental probability results?

• By guessing the outcomes

• By changing the probability

• By conducting fewer trials

• By conducting more trials

If you add up all the probabilities of possible outcomes, what should the total be?

• 100

• It varies

• 0

• 1

What is the probability of spinning a blue on a spinner with 5 blue and 11 yellow sectors?

• 5/16

• 11/16

• 1/4

• 1/2

What is the probability of pulling out a green marble from a bag with 3 green, 7 yellow, and 1 white marble?

• 10/11

• 1/11

• 7/11

• 3/11