Back to Develop a probability model and use it to find probabilities of events — Problem 2 · Task Set 45

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

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Grade 7·8 problems·~12 min·Common Core Math - Grade 7·standard·7-sp-c-7

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Concepts

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?

No — every outcome in the sample space must have an assigned probability, and all of them must sum to 1

Yes — as long as the listed probabilities are each between 0 and 1, it doesn't matter if an outcome is left out

Yes — Yellow can be assumed to have probability 0 since it wasn't mentioned

No — because 0.3 appears twice, which is not allowed in a probability model