Probability Lessons 1-4 Review

Describe the likelihood of the following event occurring:

Bills are due on the 32nd of the month.

• Impossible

• Unlikely

• Equally Likely

• Likely

• Certain

Describe the likelihood of the following event occurring:

It will rain if there is thunder.

• Impossible

• Unlikely

• Equally Likely

• Likely

• Certain

Describe the likelihood of the following event occurring:

Scoring a touchdown will result in 6 points.

• Impossible

• Unlikely

• Equally Likely

• Likely

• Certain

Describe the likelihood of the following event occurring:

If you do your homework, your grades will improve.

• Impossible

• Unlikely

• Equally Likely

• Likely

• Certain

Answer explanation

All of the probabilities for red, green, and white have to add up to 1.

Add red and green's probabilities together and subtract from one.

The letters in the word APRIL are put into a bag and drawn randomly. Find the probability:

P(A) _______

The letters in the word APRIL are put into a bag and drawn randomly. Find the probability:

P(vowel') _______

Answer explanation

The complement of a vowel is a consonant.

In Mr. Martinez's sixth period class, there are 8 bus riders and 12 walkers.

What is the probability of randomly selecting a student that walks to school?

Answer explanation

8 + 12 = 20 students total

Since there are 12 students who walk, the probability of selecting a student that walks to school is 12/20, or 3/5 simplified.

The weather report says there is a 30% chance of rain.

What is the probability that it does not rain?

• 30%

• 70%

• 50%

• 90%

The numbers 1 - 12 are written on a card and placed in a bag.

What is the probability that a number divisible by 3 is drawn?

What represents its complement?

Answer explanation

The numbers 3, 6, 9, and 12 are divisible by 3. That means the probability is 4 out of 12, or 1/3 simplified.

The complement is represented by 1 subtracted by 1/3, which is 2/3.