Answered: A standardized exam's scores are…

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

A standardized exam's scores are normally distributed. In a recent year, the mean test score was 1505 and the standard deviation was

317 The test scores of four students selected at random are

1900

1220

2250,

and

1400

Find the z-scores that correspond to each value and determine whether any of the values are unusual.

A) The Z score for 1900

B) The Zscore for 1220

C) The Zscore for 2250

D) The Zscore for 1400

A) The Unusual Values are/is ___

B) None of the values are unusual

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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