S A test consists of 90 multiple choice questions, each with five possible answers, only one of which is correct. Find the mean and the standard deviation of the number of correct answers. A) mean: 45; standard deviation: 6.71 B) mean: 18; standard deviation: 4.24 D) mean: 45; standard deviation: 3.79 C) mean: 18; standard deviation: 3.79 b A test consists of 10 multiple choice questions, each with five possible answers, one of which is correct. To pass the test a student must get 60% or better on the test. If a student randomly guesses, what is the probability that the student will pass the test? A) 0.205 B) 0.006 C) 0.377 D) 0.060
S A test consists of 90 multiple choice questions, each with five possible answers, only one of which is correct. Find the mean and the standard deviation of the number of correct answers. A) mean: 45; standard deviation: 6.71 B) mean: 18; standard deviation: 4.24 D) mean: 45; standard deviation: 3.79 C) mean: 18; standard deviation: 3.79 b A test consists of 10 multiple choice questions, each with five possible answers, one of which is correct. To pass the test a student must get 60% or better on the test. If a student randomly guesses, what is the probability that the student will pass the test? A) 0.205 B) 0.006 C) 0.377 D) 0.060
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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Transcribed Image Text:3 0.03
4 0.01
A) mean: 1.23; standard deviation: 0.44
C) mean: 1.30; standard deviation: 0.44
B) mean: 1.30; standard deviation: 0.32
D) mean: 1.23; standard deviation: 0.66
S A test consists of 90 multiple choice questions, each with five possible answers, only one of which
is correct. Find the mean and the standard deviation of the number of correct answers.
A) mean: 45; standard deviation: 6.71
C) mean: 18; standard deviation: 3.79
B) mean: 18; standard deviation: 4.24
D) mean: 45; standard deviation: 3.79
b A test consists of 10 multiple choice questions, each with five possible answers, one of which is
correct. To pass the test a student must get 60% or better on the test. If a student randomly guesses,
what is the probability that the student will pass the test?
A) 0.205
B) 0.006
C) 0.377
D) 0.060
Assume that male and female births are equally likely and that the birth of any child does not
affect the probability of the gender of any other children. Find the probability of at most three boys
in ten births.
A) 0.300
B) 0.172
C) 0.003
D) 0.333
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