Chapter 4: Discrete Probability Distributions Finding and Interpreting Mean, Variance, and Standard Deviation In Exercises 31-36, find the mean, variance, and standard deviation of the binomial distribution for the given random variable. Interpret the results and determine any unusual values. 31. Penalty Shots Thirty-three percent of penalty shots in the National Hockey League are converted. The random variable represents the number of penalty shots converted out of six randomly chosen attempts. (Source: Hockey Reference) 32. SAT Test Multiple choice questions on the SAT college admissions exam have four choices. The random variable represents the number of correct answers when you randomly guess the answer for seven questions. 36. Supreme Court Ten percent of college graduates think that Judge Judy serves on the Supreme Court. You randomly select 10 college graduates and ask them whether they think that Judge Judy serves on the Supreme Court. The random variable represents the number who think that Judge Judy serves on the Supreme Court. (Source: CNN)
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