Answered: IQ test scores are standardized to…

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

IQ test scores are standardized to proceed a normal distribution with the mean of u =100 and a standard deviation of 0 = 15. Find the proportion of the population in each of the following IQ categories.

a. Genius or new genius IQ greater than 140

b. Very Superior intelligence IQ between 120 and 40

c. Average or normal intelligence IQ between 90 and 109

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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