Understanding Probability

Question 1

A bag of marbles has 5 blue marbles, 3 red marbles, and 6 yellow marbles. A marble is drawn from the bag at random. How many possible outcomes are there?

Revolt · Accepted Answer

D: 14

Question 2

Question 2

Revolt · Accepted Answer

: Impossible; : Certain

Question 3

An event with a probability of 0 is ✔ ImpossibleLess likely to happenMore likely to happenCertain

Revolt · Accepted Answer

A: ✔ Impossible

Question 4

Which of the following events has a probability of 1? Check all that apply.

Revolt · Accepted Answer

A: landing on a blue or red space on a spinner with 1 blue space and 1 red space; D: drawing a red card from a stack of 20 red cards; E: getting a heads or a tails when flipping a coin

Question 5

Which of these values cannot represent the probability of an event happening?

Revolt · Accepted Answer

D: 1.2

Question 6

Which of the following are ways to express the same probability? Check all that apply.

Revolt · Accepted Answer

A: 30%; B: 3/10; D: 0.3

Question 7

You are rolling a 6-sided number cube with the numbers 1 through 6. Which of the following represents the probability of rolling an even number?

Revolt · Accepted Answer

C: 1/2

Question 8

P(event) =

Revolt · Accepted Answer

50%

Question 9

Which pair does not represent the probabilities of complementary events?

Revolt · Accepted Answer

C: 0.25 and 0.50

Question 10

Does choosing a blue marble represent the complement event of choosing a red marble? Explain.

Revolt · Accepted Answer

No, choosing a blue marble does not represent the complement event of choosing a red marble. The complement of choosing a red marble is choosing any marble that is not red (which includes both blue and purple marbles). Since there are purple marbles, the probability of red (1/5) and blue (2/5) does not sum to 1, as required for complementary events.

Understanding Probability Answers

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