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Back to Tutor Intake Assessment: Develop a probability model and use it to find probabilities of events

7.SP.C.7 Tutor Intake -- Probability Models: Uniform and Non-Uniform

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without a calculator. If you're unsure, give your best try — the goal is
to find what to work on together, not to grade you.

Grade 7·8 problems·~12 min·Common Core Math - Grade 7·standard·7-sp-c-7
Work through problems with immediate feedback
A

Concepts

1

What is a probability model?

2

A student proposes this probability model for a 4-outcome
spinner: P(Red) = 0.3, P(Blue) = 0.3, P(Green) = 0.2. The
spinner also has a Yellow section, but the student didn't assign
it a probability. Is this a valid probability model?

3

A bag contains 8 tiles, all the same size and shape, each with a
different letter. You will draw one tile at random. Which
probability model correctly describes this situation?

B

Procedures

1

A standard six-sided die is rolled once. Using a uniform
probability model, what is the probability of rolling a prime
number? (The prime numbers on a die are 2, 3, and 5.) Enter your
answer as a fraction in the form a/b.

2

A card is drawn at random from a standard 52-card deck. Using a
uniform probability model, what is the probability of drawing a
Heart? Enter your answer as a fraction in the form a/b.

3

A spinner is spun 200 times: Red lands 70 times, Blue lands 90
times, and Yellow lands 40 times. Using this data to build a
non-uniform probability model, what probability should be
assigned to Blue? Enter your answer as a decimal.

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