Question 2 – Normal Distribution The time needed to complete a final examination in a particular college course is normally distributed with a mean of 160 minutes and a standard deviation of 20 minutes. Answer the following questions: a. What is the probability of completing the exam in 120 minutes or less? b. What is the probability that a student will complete the exam in more than 120 minutes but less than 150 minutes? c. What is the probability that a student will complete the exam in more than 100 minutes but less than 170 minutes?

Question 2 – Normal Distribution The time needed to complete a final examination in a particular college course is normally distributed with a mean of 160 minutes and a standard deviation of 20 minutes. Answer the following questions: a. What is the probability of completing the exam in 120 minutes or less? b. What is the probability that a student will complete the exam in more than 120 minutes but less than 150 minutes? c. What is the probability that a student will complete the exam in more than 100 minutes but less than 170 minutes?

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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Estimation

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Question 2 – Normal Distribution
The time needed to complete a final examination in a particular college course is normally
distributed with a mean of 160 minutes and a standard deviation of 20 minutes. Answer the
following questions:
a. What is the probability of completing the exam in 120 minutes or less?
b. What is the probability that a student will complete the exam in more than 120 minutes
but less than 150 minutes?
c. What is the probability that a student will complete the exam in more than 100 minutes
but less than 170 minutes?
d. Assume that the class has 120 students and that the examination period is 180 minutes in
length. How many students do you expect will be unable to complete the examination in
the allotted time?

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