Answered: At a certain college, the time that is…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Question

At a certain college, the time that is required by students to complete the
mathematics competency exam is approximately a normal distribution with a mean of 57.6 minutes and a standard deviation of 8 minutes. Find the
probability that a student takes
a) At least 45 minutes to complete the test.
b) No longer than 40 minutes to complete the test.
c) Exactly 50 minutes to complete the test.
d) If the college has a 90-minute time limit for this test, what percentage of
all students do not finish the test?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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