1. The EPA fuel economy estimates for automobile models tested recently predicteda mean of 24.8 mpg and a standard deviation of 6.2 mpg for highway driving.a. About what percent of cars get less than 31 mpg?b. What percent of cars get more than 20 mpg?c. What percent of cars get between 22 and 30 mpg?d. What gas mileage represents the 75th percentile?e. What gas mileages separate the bottom 3% and top 3% of cars?X

Mean=M=24.8, Standard deviation=S=6.2 Note: According to bartelby question answer guidelines an…

Answered: 1. The EPA fuel economy estimates for…

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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Topic is Normal Distribution
Obtain the five-number summary for the given data. The normal annual precipitation (in inches) is given below for 21 different U.S. cities. 39.133.018.535.327.127.8 8.6 23.042.634.120.312.0 5.113.2 22.010.915.925.417.215.251.7
Find the Population standard deviation for 2016.
In a population of ages where the mean age is 45 and the standard deviation is 5.25, what are the ages of the youngest 7% and the oldest 12%?
6.85 A variable is normally distributed with mean 6 and stan- dard deviation 2. Find the percentage of all possible values of the variable that a. lie between 1 and 7. c. are less than 4. b. exceed 5.
This is the homework Exercise 3.36. The combined city and highway gas mileage of the vehicles is approximately Normal with mean 23.0 miles per gallon (mpg) and standard deviation 4.9 mpg. How high must a vehicle's gas mileage be to fall in the top 15% of all vehicles?
A. What's the standard deviation for data set 1. B. What's the standard deviation for data set 2. C. What's the standard deviation for data set 3.
2. What percent of values of a normally distributed variable lie between the mean and two standard deviationsbelow the mean?A. 47.5%B. 34% C. 95% D. 68%
2. The resting heart rates of a group of healthy adult men were found to have a mean of 73.4 beats per minute, with a standard deviation of 5.9 beats per minute. What percent of these men had a resting heart rate of a. greater than 80 beats per minute? b. between 78 and 89 beats per minute?
5. Use the following values to answer the items below: 4, 4, 4, 5, 5, 6, 6, 6, 6, 7, 8, 8, 9, 9, 10, 11 a. Create a simple frequency distribution table. Include columns for frequency, proportion, cumulative frequency, and cumulative percent. b. What is the N? c. What is the mean? d. What is the mode? e. What is the percentile rank of X = 6.5? f. What is the P75 ?
Suppose you are asked to toss a coin 16 times and calculate the proportion of the tosses that were heads. a. What shape would you expect this histogram to be and why? b. Where you do expect the histogram to be centered? c. How much variability would you expect among these proportions? d. Explain why a Normal model should not be used here.
In its Fuel Economy Guide for 2016 model vehicles, the Environmental Protection Agency gives data on 1170 vehicles. There are a number of high outliers, mainly hybrid gas-electric vehicles. If we ignore the vehicles identified as outliers, however, the combined city and highway gas mileage of the other 1146 vehicles is approximately Normal with mean 23.0 miles per gallon (mpg) and standard deviation 4.9 mpg. Exercises 3.35 through 3.38 concern this distribution 3.37: The middle half. The quartiles of any distribution are the values with cumulative proportions 0.25 and 0.75. They span the middle half of the distribution. What are the quartiles of the distribution of gas mileage?

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