68% ofstatisticsMean95% ofstatistics99.7% ofstatisticsAMeanMean1 st.1 st.2 st. devbelow2 st devabove3 st. devbelow3 st devabovedevdevbelowaboveThe number of potholes in any given 1-mile stretch of freeway pavement in Pennsylvania has aNormal distribution. This distribution has a mean of 64 potholes, and a standard deviation of 9potholes. Using the Empirical Rule, what is the approximate percentage of 1-mile long roadwayswith potholes numbering between 55 potholes and 73 potholes?%

Given a mean of 64 potholes, and a standard deviation of 9 potholes.

Answered: 68% of statistics Mean 95% of…

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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A company produces scooters used by small businesses that find them convenient for making short deliveries. The company is notified whenever a scooter breaks down, and the problem is classified as being either mechanical or electrical. The company then matches the scooter to the plant where it was assembled. The data table to the right contains a random sample of 200 breakdowns. Use the data file and the relative frequency assessment method to complete parts a through c. Electrical Mechanical Total Plant 1 21 52 73 Plant 2 74 53 127 Total 95 105 200 a. What is the probability a scooter was assembled at Plant 2? P(Plant 2) = (Type an integer or a decimal.) b. What is the probability that a scooter breakdown was due to a mechanical problem? P(mechanical) =D(Type an integer or a decimal.) c. What is the probability that a scooter breakdown was due to an electrical problem and the scooter was assembled at Plant 2? P(electrical and Plant 2) = (Type an integer or a decimal.)
If the mean speed for a major league fast ball is 90 miles per hour and the standard deviation is 5 miles per hour, what would the standardized score be for a pitch that is 97 miles per hour? O 0.4 4.0 1.4 O 1.0
1. Given the data set: {3, 5, 6, 9, 4,7,4,2,3,9, 1, 3, 8} provide the following rounded to two decimal places if needed) The mean а) b) The median The mode c) The range _The midrange d) e The five number summary f) g) A box and whisker plot: draw below using the provided number line for scale. 3 6 10 1 2 4 7 89 h) Is this data set skewed_yes - positive/right, yes - negative/left or no - symmetric (circle one) _The standard deviation (O i) j) Most of the data in the set above are between - 6 and u6. Calculate these values and verify this statement based on the set above. k) According Chebyshev's Theorem, what fraction of the set lie within 2 standard deviations of the mean? Verify this based on the set above
1. The EPA fuel economy estimates for automobile models tested recently predicted a 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
1. The mean age for licensed physicians in the United States is 51.5 years. A government officialrandomly selects 700 licensed physicians and computes their mean age to be 50.9 years.a. Which value is the parameter and which the statistic? b. Is it unreasonable that the mean of the 700 physicians is different than 51.5? Explain.
A recent report indicated a typical family spend $650 per month on food. Assume the distribution of food expenditures for a family of five follows a normal distribution, with mean of $650 and standard deviation of $120. A sample of 64 is taken. a) What percentage of the families spends more than $675 per month on food? b) What percentage of the families spends less than $660 per month on food? c) What percentage of the families spends between $660 and $670 per month on food? d) What percentage of the families spends less than $650 or more than $675 per month on
If the standard error for a sample of size 50 is ?=135.21s then the standard error for the mean ?s which of the following: 2.70 135.21 19.12 67.36
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