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Get Full Access to Elementary Statistics - 12 Edition - Chapter 5.5 - Problem 2cqq
Get Full Access to Elementary Statistics - 12 Edition - Chapter 5.5 - Problem 2cqq

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

ISBN: 9780321836960 18

## Solution for problem 2CQQ Chapter 5.5

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:

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

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