Probability

Which number best represents the probability of an impossible event?

• 1

• 0.5

• 0

• 0.25

A weather forecast says there's a 0.9 chance of rain. What does this mean?

• It will definitely rain.

• It is very likely to rain.

• It is unlikely to rain.

• It will not rain.

A fair coin is flipped 1,000 times and lands on heads 510 times. What is the approximate probability of heads based on this data?

• 0.40

• 0.51

• 0.60

• 0.75

Which situation describes a uniform probability model?

• Rolling a weighted die

• Spinning a spinner where some sections are larger than others

• Flipping a fair coin

• Drawing a name more often than others from a jar

What is the probability of randomly choosing a vowel from the letters in the word “PROBABILITY”?

• 3/11

• 4/11

• 5/11

• 6/11

You roll a number cube 600 times. What is a good prediction for the number of times you roll a 2 or 4?

• 50

• 200

• 300

What is the probability of selecting a student at random from a class of 20 where 12 are girls and 8 are boys, and selecting a boy?

• 2/3

• 8/20

• 12/20

• 1/3

If a spinner lands on red 60% of the time and on blue 40%, what is the probability model?

• Red: 0.3, Blue: 0.7

• Red: 0.6, Blue: 0.4

• Red: 0.4, Blue: 0.6

• Red: 0.5, Blue: 0.5

A tree diagram is used to show all possible outcomes of flipping a coin and rolling a number cube. How many total outcomes are there?

• 6

• 10

• 12

• 2

You toss a paper cup 100 times and it lands open-end down 45 times. What is the approximate probability of that event?

• 0.25

• 0.45

• 0.55

• 0.60