Maria is taking a multiple-choice test with 5 options for each question, and 3 marks for each correct answer. The test is negatively marked, which means she is deducted points for each answer she gets wrong. She will not be deducted any marks if she does not attempt the question. Maria is trying to figure out if it is beneficial to guess the answer to a question once she has narrowed down the number of potentially correct answers. Assume that once Maria has narrowed down the questions, all remaining answers are equally likely to be correct from Maria’s point of view. A guess is worthwhile if it is a better option than not attempting the question. Question On the first question, Maria will lose 1 mark if she is incorrect. What is the minimum number of answers Maria will need to eliminate for a guess to be worthwhile?

Maria is taking a multiple-choice test with 5 options for each question, and 3 marks for each correct answer. The test is negatively marked, which means she is deducted points for each answer she gets wrong. She will not be deducted any marks if she does not attempt the question. Maria is trying to figure out if it is beneficial to guess the answer to a question once she has narrowed down the number of potentially correct answers. Assume that once Maria has narrowed down the questions, all remaining answers are equally likely to be correct from Maria’s point of view. A guess is worthwhile if it is a better option than not attempting the question. Question On the first question, Maria will lose 1 mark if she is incorrect. What is the minimum number of answers Maria will need to eliminate for a guess to be worthwhile?

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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On the first question, Maria will lose 1 mark if she is incorrect. What is the minimum number of answers Maria will need to eliminate for a guess to be worthwhile?

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