Compound events and tree diagrams

Probabilities of two or more events using lists, tables, and tree diagrams.

Standards:7.SP.C.8

Try it: three questions

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

Question 1 of 3

A bag contains 3 red balls and 2 blue balls. You draw one ball, do NOT replace it, then draw a second ball. What is the probability that both balls are red?

Question 2 of 3

A class of 150 students was surveyed about their streaming service preferences. 45 students chose Netflix, 36 chose Hulu, 39 chose Disney+, and the rest chose other services. What fraction of the class chose Netflix?

Question 3 of 3

A survey of 120 students asks whether they prefer tea or coffee. 45 students prefer tea. If a student is randomly selected, what is the probability they prefer coffee?

How this fits in

Compound events and tree diagrams 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.

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