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Suppose a biology student is about to take an exam that is entirely multiple choice, where each question has 5 answer choices. This student only studied 60% of the material that is covered on this exam, so let us assume that there is a 60% chance that she knows the correct answer to any given question. If she does not know the answer, she will choose an answer at random. If the exam has a total of 40 questions on it, how many would you expect her to get wrong?

Suppose a biology student is about to take an exam that is entirely multiple choice, where each question has 5 answer choices. This student only studied 60% of the material that is covered on this exam, so let us assume that there is a 60% chance that she knows the correct answer to any given question. If she does not know the answer, she will choose an answer at random. If the exam has a total of 40 questions on it, how many would you expect her to get wrong?

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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Question
1
Suppose a biology student is about to take an exam that is entirely multiple choice, where each question has 5 answer choices. This student only studied 60% of the material that is covered on this exam, so let us assume that there is a 60% chance that she knows the correct answer to any given question. If she does not know the answer, she will choose an answer at random. If the exam has a total of 40 questions on it, how many would you expect her to get wrong? QUESTION 28 There is a new test for detecting whether or not mosquitos are infected with malaria. For infected mosquitos, the test has a 91% chance of detecting it (a positive test result). For uninfected mosquitos, the test will correctly produce a negative result 78% of the time. You are testing it out on a population of mosquitos in which 18% are known to be infected. If you randomly selected a mosquito to test from this population, what is the probability that it is infected and got a negative result? (round to 3 decimal places) QUESTION 29 A study investigating the links between health risks and education surveyed adults in a metropolitan area and found that 19% of those without a high school degree, 15% of those with a high school degree/GED, and 7% of those with a college degree smoke cigarettes daily. If you randomly selected 5 people in this area who do not have a high school degree, what is the probability that at least one of them smokes daily? (round to 3 decimal places)
Transcribed Image Text:Suppose a biology student is about to take an exam that is entirely multiple choice, where each question has 5 answer choices. This student only studied 60% of the material that is covered on this exam, so let us assume that there is a 60% chance that she knows the correct answer to any given question. If she does not know the answer, she will choose an answer at random. If the exam has a total of 40 questions on it, how many would you expect her to get wrong? QUESTION 28 There is a new test for detecting whether or not mosquitos are infected with malaria. For infected mosquitos, the test has a 91% chance of detecting it (a positive test result). For uninfected mosquitos, the test will correctly produce a negative result 78% of the time. You are testing it out on a population of mosquitos in which 18% are known to be infected. If you randomly selected a mosquito to test from this population, what is the probability that it is infected and got a negative result? (round to 3 decimal places) QUESTION 29 A study investigating the links between health risks and education surveyed adults in a metropolitan area and found that 19% of those without a high school degree, 15% of those with a high school degree/GED, and 7% of those with a college degree smoke cigarettes daily. If you randomly selected 5 people in this area who do not have a high school degree, what is the probability that at least one of them smokes daily? (round to 3 decimal places)
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