Answered: 1) Speeds of vehicles at a certain…

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

1) Speeds of vehicles at a certain highway location are normally distributed with a mean of 66.4 and a standard deviation of 8.8. Find the speed in mph that separates the fastest 4% from the others. Select one:

a) 84.0

b) 81.8

c) 69.9

d) 70.9

e) 51.0

2) Find the number of respondents needed in a poll to determine within 1.5% margin of error, the percentage of US adults that prefer divided government. Use 90% conifdence and assume about 32% of US adults prefer divided government.

Select one:

a) 1693

b) 30

c) 1922

d) 3403

e) 2618

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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