The mean lifetime of a certain tire is 20,000 miles and the standard deviation is 1000 miles. (Give your answers correct to onedecimal place.)(a) If we assume the mileages are normally distributed, then approximately what percentage of all such tires will lastbetween 17,000 and 23,000 miles?%(b) If we assume nothing about the shape of the distribution, then at least what percentage of all such tires will lastbetween 17,000 and 23,000 miles?%

mean==20000standard deviation==1000

Answered: The mean lifetime of a certain tire is…

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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One of the z-score formulas will help on this question. Scores on the SAT test are normally distributed with a mean of 500 and standard deviation of 100 points. Pretend someone scored 400 on the math portion of the SAT test. What would be the z-score cut off for this score? A. 1.0 B. -1.0 C. 0 D. 2.0
help please answer in text form with proper workings and explanation for each and every part and steps with concept and introduction no AI no copy paste remember answer must be in proper format with all working
A population has a standard deviation ? of 25 units. (Give your answers correct to two decimal places.) (a) Find the standard error for the mean if n = 30.(b) Find the standard error for the mean if n = 46.(c) Find the standard error for the mean if n = 71.
The Truly Amazing Dudes are a group of comic acrobats. The weights (in pounds) of the ten acrobats are as follows. 152 196 144 139 166 83 186 157 140 138 (a) Find the mean and standard deviation of the weights. (Round the answers to one decimal place.) x = s = (b) What percent of the data lies within one standard deviation of the mean?(c) What percent of the data lies within two standard deviations of the mean?
Questions 5-6. The average woman’s height is 65 inches with a standard deviation of 3.5 inches. What is the z-score for someone 72 inches tall? (round to the tenths place) What proportion of women are taller than 72 inches tall? % (enter answer as a percent rounded to the nearest hundredth as needed) Questions 7. The average woman’s height is 65 inches with a standard deviation of 3.5 inches. What proportion of women are shorter than 60 inches tall? (enter answer as a percent rounded to the nearest hundredth as needed) Question 8. In what percentile is a woman that is 61 inches tall? Group of answer choices A 14th percentile B 86th percentile C 10th percentile D 12th percentile
ats 2. In the mid-19th century, Sir Francis Galton demonstrated, through extensive data collection, that many human characteristics such as height and IQ are distributed throughout the entire population in accordance with the normal distribution. Galton recorded the heights of 8585 men in Great Britain. This forms a normal distribution with a mean of 67 inches and standard deviation of 2.5 inches. (a) Graph this normal distribution and label the x-axis. (b) What proportion of these men were between 66 and 68 inches tall? belool vin (c) What fraction of the adult male population in Great Britain was within one standard deviation of the mean height? [Use the normal distribution function in Excel, not the Empirical Rule] (d) What height corresponds to the 95th percentile in the Galton study?
Which of the following statements is not true? There is only one median for each variable. One definition of the median states that, for an odd number of observations, the median is the middle score when scores are placed in order of magnitude. Another term for the median is 50th percentile. The median is generally more sensitive to (i.e., affected by) the presence of a few extreme observations than is the mean.
We'd like to compare two populations A and B. Population A has a mean of 40 and a standard deviation of 4. Population B has a mean of 50 and a standard deviation of 7. We will randomly select a sample of size 100 from population A, and a sample of size 100 from population B. What is the standard deviation of the difference of sample means? So, you need to find op where D =XA-Xg. Round your answers with 2 decimal digits after the decimal point, like 8.23, or 0.92, etc.
Find the indicated IQ score. The graph to the right depicts IQ scores of adults, and those scores are normally distributed with a mean of 100 and a standard deviation of 15. Click to view page 1 of the table. Click to view page 2of tihe fable 0.9 The indicated IQ score, x, is (Round to one decimal place as needed.)
Question 3 Marquis scored 82 in the class with the mean /5.5 and the standard deviation 5.4, but Rhianna scored 69 in the class with the mean 58.9 and the standard deviation 9.1. Who scored relatively better? (Round the answers to 2 decimal places) Marquis's z-score is Marquis's z-score is Select an answer Select an answer less than greater than the same as and Rhianna's z-score is Rhianna's z-score, we conclude that Select an answer Select an answer Rhianna did relatively better Marquis and Rhianna did relatively the same Marquis did relatively better Since

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