here this is binomial distribution with parameter n=25 and p=probability of getting a answer correct =1/5=0.2
a) hence % of question answered correctly =p*100=(0.2)*100=20%
b)std deviation =sqrt(p*(1-p)/n)*100=sqrt(0.2*0.8/25)*100=8.00%
Assume that a student did not have time to study and is simply guessing at the...
Exercise 3.10. Guessing on an exam. While taking a probability exam, you come to three questions that you have no clue how to answer. You would have known the answers if you had taken the time to study the night before instead of going to a party, but you did not make a good life choice, and you vow to never party on a school night again if you fail this exam. Each question on the exam is multiple choice...
Exercise 3.10. Guessing on an exam. While taking a probability exam, you come to three questions that you have no clue how to answer. You would have known the answers if you had taken the time to study the night before instead of going to a party, but you did not make a good life choice, and you vow to never party on a school night again if you fail this exam. Each question on the exam is multiple choice...
For questions 5-8, suppose there is a test that consists of 200 multiple-choice questions. Each question has five options, which meansthat people who answer the questions purely by guessing will get an average score of 40 (because they will guess correctly one fifth of the time, on average). You administer the test to a group of 31 students. The average score for the group of students is 37.3, and their standard deviation is 6.42. For the null hypothesis, let's assume...
A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 40% of the questions correct. (Round your answer to three decimal places.)
A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 60% of the questions correct. (Round your answer to three decimal places.)
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