Grade 7 Probability Practice Test

Correct answer: A

The correct answer is $\frac{1}{2}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: There are 3 even outcomes out of 6: $\frac{3}{6}=\frac{1}{2}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: B

The correct answer is $\frac{1}{2}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: There is 1 favorable outcome out of 2 equally likely outcomes: $\frac{1}{2}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: C

The correct answer is $\frac{3}{5}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: There are 3 red marbles out of 5 total marbles: $\frac{3}{5}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: D

The correct answer is $\frac{1}{4}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: There is 1 blue section out of 4 equal sections: $\frac{1}{4}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: A

The correct answer is $\frac{1}{3}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: The favorable outcomes are 5 and 6, so $\frac{2}{6}=\frac{1}{3}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: B

The correct answer is $\frac{3}{8}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: There are 3 yellow marbles out of 8 total: $\frac{3}{8}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: C

The correct answer is $\frac{2}{5}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: The probability is $\frac{4}{10}=\frac{2}{5}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: D

The correct answer is $\frac{3}{8}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: There are 3 winning outcomes out of 8: $\frac{3}{8}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: A

The correct answer is $\frac{1}{2}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: There are 3 odd outcomes out of 6: $\frac{3}{6}=\frac{1}{2}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.

Correct answer: B

The correct answer is $\frac{7}{12}$.

1. Describe the sample space: Count the equally likely outcomes or identify the favorable outcomes for the event.
2. Calculate the probability: There are 7 white marbles out of 12 total: $\frac{7}{12}$.
3. Check the result: Confirm that the probability is between 0 and 1 and that the fraction or decimal is simplified.