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A psychology quiz consists of 20 multiple chice questions with five possible answers for each question. A student, say John, is totally unprepared so randomly guesses the answer to each question. This means that John has a probability of 1/5 = .20 of getting any particular problem correct.Let X equal the number of questions out of the 20 questions that John gets correct. Do the calculations below using R. d. What is the probability that X > 6? e. Using R's qbinom() function calculate the 70th percentile of X ? f. What is the expected value of X?

A psychology quiz consists of 20 multiple chice questions with five possible answers for each question. A student, say John, is totally unprepared so randomly guesses the answer to each question. This means that John has a probability of 1/5 = .20 of getting any particular problem correct.Let X equal the number of questions out of the 20 questions that John gets correct. Do the calculations below using R. d. What is the probability that X > 6? e. Using R's qbinom() function calculate the 70th percentile of X ? f. What is the expected value of X?

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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A psychology quiz consists of 20 multiple chice questions with five possible answers for each question. A student, say John, is totally unprepared so randomly guesses the answer to each question. This means that John has a probability of 1/5 = .20 of getting any particular problem correct. Let X equal the number of questions out of the 20 questions that John gets correct. Do the calculations below using R. d. What is the probability that X > 6? e. Using R's qbinom() function calculate the 70th percentile of X ? f. What is the expected value of X?
Transcribed Image Text:A psychology quiz consists of 20 multiple chice questions with five possible answers for each question. A student, say John, is totally unprepared so randomly guesses the answer to each question. This means that John has a probability of 1/5 = .20 of getting any particular problem correct. Let X equal the number of questions out of the 20 questions that John gets correct. Do the calculations below using R. d. What is the probability that X > 6? e. Using R's qbinom() function calculate the 70th percentile of X ? f. What is the expected value of X?
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