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There are 100 questions from an SAT test, and they are all

Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola ISBN: 9780321836960 18

Solution for problem 2CQQ Chapter 5.5

Elementary Statistics | 12th Edition

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Elementary Statistics | 12th Edition | ISBN: 9780321836960 | Authors: Mario F. Triola

Elementary Statistics | 12th Edition

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Problem 2CQQ

Problem 2CQQ

There are 100 questions from an SAT test, and they are all multiple choice with possible answers of a, b, c, d, e. For each question, only one answer is correct. Find the mean number of correct answers for those who make random guesses for all 100 questions.

Step-by-Step Solution:

Answer :

Step 1 of 1

We know that

There are 100 questions from an SAT test, and they are all multiple choice with possible answers of a, b, c, d, e. For each question, only one answer is correct.

So, n = 100

p =

P =

p = 0.2

Let the mean number of correct answers for those who make random guesses for all 100 questions.

Then the mean of the formula is  

μ=np

μ =(100) (0.2)  

μ = 20 

Therefore the mean number of correct answers for those who make random guesses for all 100 questions is μ =156 

 

Step 2 of 1

Chapter 5.5, Problem 2CQQ is Solved
Textbook: Elementary Statistics
Edition: 12
Author: Mario F. Triola
ISBN: 9780321836960

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There are 100 questions from an SAT test, and they are all