A science teacher presented a balloon to her class, and posed the question, "If I keep this balloon in the freezer overnight, what will occur?" She followed up with, "How certain are you of your answer?" The teacher recorded her students' responses. The probability that a student believes the balloon will shrink is 0.7, the probability that a student was certain is 0.3 and the probability that a student believes the balloon will shrink and was certain is 0.2. What is the probability that a randomly chosen student believes the balloon will shrink or was certain?

A science teacher presented a balloon to her class, and posed the question, "If I keep this balloon in the freezer overnight, what will occur?" She followed up with, "How certain are you of your answer?" The teacher recorded her students' responses. The probability that a student believes the balloon will shrink is 0.7, the probability that a student was certain is 0.3 and the probability that a student believes the balloon will shrink and was certain is 0.2. What is the probability that a randomly chosen student believes the balloon will shrink or was certain?

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section11.8: Probabilities Of Disjoint And Overlapping Events

Problem 2C

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