Simple probability

Favorable outcomes over total outcomes, from dice and spinners to real-world estimates.

Standards:7.SP.C.57.SP.C.7

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 3

A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. If you draw one marble without looking, what is the probability it is blue?

Question 2 of 3

A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. If you draw one marble at random, what is the probability that it is blue?

Question 3 of 3

A bag contains 5 red marbles, 3 blue marbles, and 2 green marbles. If you draw one marble at random, what is the probability it is blue?

How this fits in

Simple probability is one skill in the Statistics & Probability unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

Practice simple probability until it sticks

Unlimited fresh questions, hands-on problem types, a tutor while you work, and a review schedule that keeps it learned. Free, no credit card.

Start practicing free