Each multiple choice question consisting of 5 choices has just one correct answer. If a student makes random guesses, the probability of getting the correct answer is 0.2. An exam consists of 10 sequentially appearing MCQs. A student coming unprepared to the exam intends to make random choices. a. What is the probability that she gets at least 8 of them correct. b. What is the probability that she needs to attempt 4 question to get the first correct guess c. What is the probability that she has to attempt 8 to get 4 correct answers?
Each multiple choice question consisting of 5 choices has just one correct answer. If a student makes random guesses, the probability of getting the correct answer is 0.2. An exam consists of 10 sequentially appearing MCQs. A student coming unprepared to the exam intends to make random choices. a. What is the probability that she gets at least 8 of them correct. b. What is the probability that she needs to attempt 4 question to get the first correct guess c. What is the probability that she has to attempt 8 to get 4 correct answers?
A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
Publisher:Sheldon Ross
Chapter1: Combinatorial Analysis
Section: Chapter Questions
Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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Each multiple choice question consisting of 5 choices has just one correct answer. If a student makes random
guesses, the probability of getting the correct answer is 0.2. An exam consists of 10 sequentially appearing
MCQs. A student coming unprepared to the exam intends to make random choices.
a. What is the probability that she gets at least 8 of them correct.
b. What is the probability that she needs to attempt 4 question to get the first correct guess
c. What is the probability that she has to attempt 8 to get 4 correct answers?
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