Two-way tables and conditional probability

Read joint and marginal frequencies and find the probability of one event given another.

Standards:8.SP.A.4S-CP.A.4

Try it: three questions

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

Question 1 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 2 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?

Question 3 of 3

A school cafeteria surveyed 250 students about their lunch preference. The results showed: 85 chose pizza, 60 chose pasta, 55 chose salad, and the rest chose other options. What is the probability that a randomly selected student chose pizza?

How this fits in

Two-way tables and conditional 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.

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