Solution Found!
Using the same SAT questions described in Exercise, find
Chapter 5, Problem 3CQQ(choose chapter or problem)
Problem 3CQQ
Using the same SAT questions described in Exercise, find the standard deviation for the numbers of correct answers for those who make random guesses for all 100 questions.
Exercise
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.
Questions & Answers
QUESTION:
Problem 3CQQ
Using the same SAT questions described in Exercise, find the standard deviation for the numbers of correct answers for those who make random guesses for all 100 questions.
Exercise
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.
ANSWER:Problem 3CQQ
Answer:
Step1 of 2:
We have 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. We need to find the mean number of correct answers for those who make random guesses for all 100 questions.
Here,
n = 100
S = {a,b,c,d,e}
Probability of getting correct answer P(correct) = ⅕
Hence p = ⅕