Introduction to Probability Review

The table lists the probability of four events occurring.

Which event is least likely to occur?

• Event A

• Event B

• Event C

• Event D

A box contains 1 red ball, 3 green balls, and 8 blue balls. What best defines the probability associated with picking a red ball without looking?

• Likely

• Certain

• Unlikely

• Impossible

A bag contains 50 pieces of gum flavored cherry, grape, and watermelon. William will randomly pick a piece of gum. The probability of picking cherry is 1/5. the probability of picking watermelon is 7/10.

What is the probability William will pick a piece of grape gum?

• 1/10

• 3/10

• 2/5

• 4/5

The numbers 3, 45, 22, 35, 17, 79, and 6 are written on pieces of paper and placed in a bag. A piece of paper is chosen randomly out of the bag. How likely is it that one the paper will be an odd number?

• Impossible

• Unlikely

• Likely

• Certain

What is the probability that the spinner will land on either yellow (Y) or green (G)?

• ¼

• ⅓

• ½

• ⅔

Lisa has a bag of 30 beads to make jewelry.

There are an equal number of orange, green and blue beads. Those are the only colors.

Lisa chooses a bead randomly from the bag.

What is the probability that she will choose a green or blue bead?

• 5/6

• 2/3

• 1/2

• 1/6

Ashley will roll a fair number cube. The number cube is labeled 1 to 6. What is the probability that Ashley will roll a number greater than 4?

• 2/3

• 1/2

• 1/3

• 1/6

You have a spinner 4 equal sections: red, blue, yellow, green.

What is the probability of a player spinning the color blue?

• 1/4

• 1/6

• 1/24

• 5/12

You have a 6-sided die.

What are the chances that a player will roll a number less than six?

• unlikely

• even chance

• certain

• very likely

Carlotta has a blue sweater, a red sweater, a pink sweater, and a white sweater.

She also has a pair of black pants and a pair of brown pants.

Which of the following describes the sample space available?

• 4 outcomes

• 6 outcomes

• 8 outcomes

• 10 outcomes