Answered: In the past Grades (G) of the police…

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

In the past Grades (G) of the police academy entrance exams in NYC was distributed normal with mean 66.5 and variance 100, G N(66.5, 100). Grades of 200 job applicants who took the test recently are distributed as follows:

Grade: Under 49.5 49.5-59.5 59.5-69.5 69.5-79.5 79.5 and over

Frequency: 22 38 56 50 34

Determine whether this data came from a normal distribution with mean 66.5 and variance of 100.

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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