Parth X Webwork for UK MA WeBWo K: MA320-Zi © S arch Textbook Solux © Charles Cl

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Parth X Webwork for UK MA WeBWo K: MA320-Zi © S arch Textbook Solux © Charles ClairnsTh t i Charles Clain's That l screenshot hp spectr x × x Secure https://webwork.as.uky.edu/webwork2/MA320-Zhou-S18/Homework4/5/ :; Apps Carivas UKY Amaeon.co"Online © (1pl) ANew Iredtml 0.4096 0.1096 correct Problem 1 Problem 2... Problem 3 Problem 4 Problem 5 Problem 6 Problem 7 0.6178 0.6178 incorrect At least one of the answers above is NOT correct. (1 point) For this question, you need at least 8 decimal places. An exact answer (fractions) is recommended on both parts, especially the first part since it will be used for the second question. Baumgartner, Prosser, and Crowell are grading 15 calculus exams on which there is a series of 4 multiple choice questions. Each question has 5 answer choices. Crowell says, "I bet we should expect at least three exams in which no answer is correct if everyone is just guessing." First, what is the probability that a student gets no answer correct on the 4 multiple choice questions if he or she guesses randomly with no bias? 0.4096 What is the probability that there are at least three exams with no answer correct if all 15 students are guessing? 0.6178 Preview My Answers Submit Your score was recorded. You have attempted this problem 5 times. You received a score of 75% for this attempt.

Explanation / Answer

Solution:-  

2) The probability thta there are atleast three exams with no answer correct if all 15 students are guessing is 0.977.

The probability of getting no answer correct in 4 multiple question = 0.4096

n = 15

x = 3

By applying binomial distribution

P(x,n) = nCx*px*(1-p)(n-x)

P(x > 3) = 0.977

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