Answered: The highway fuel economy of a 2016…

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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The highway fuel economy of a 2016 Lexus RX 350 FWD 6 cylinder 3.5-L automatic 5-speed using premium fuel is a normally distributed random variable with a mean of y (but backwards) = 23.50 mpg and a standard deviation of Q (but upside down) = 2.50mpg

a. what is the standard error of X (with line above it), the mean from a random sample of 25 fill-ups by one driver? (round answers to 4 decimal places)

standard error of X (with a line above.)

b. within what interval would you expect the sample mean to fall, with 98 percent probability? (round answers to 4 decimal places.)

The interval is from_______ to ________.

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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