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(b) If the permeability index is to be determined for each specimen in a random sample of size 10, how likely is it that the sample mean permeability index will be as follows? (i) between 900 and 1,200 (Round your answer to four decimal places.) P(900

(b) If the permeability index is to be determined for each specimen in a random sample of size 10, how likely is it that the sample mean permeability index will be as follows? (i) between 900 and 1,200 (Round your answer to four decimal places.) P(900

MATLAB: An Introduction with Applications
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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Water permeability of concrete can be measured by letting water flow across the surface and determining the amount lost (in inches per hour). Suppose that the permeability index x for a randomly selected concrete specimen is normally distributed with mean value 1,000 and standard deviation 150. (a) How likely is it that a single randomly selected specimen will have a permeability index between 850 and 1,300? (Round your answer to four decimal places.) P(850 < x < 1,300) = 0.8186 (b) If the permeability index is to be determined for each specimen in a random sample of size 10, how likely is it that the sample mean permeability index will be as follows? (i) between 900 and 1,200 (Round your answer to four decimal places.) P(900 < x < 1,200) = X (ii) between 850 and 1,300 (Round your answer to four decimal places.) = 0.9992 P(850 < x < 1,300)
Transcribed Image Text:Water permeability of concrete can be measured by letting water flow across the surface and determining the amount lost (in inches per hour). Suppose that the permeability index x for a randomly selected concrete specimen is normally distributed with mean value 1,000 and standard deviation 150. (a) How likely is it that a single randomly selected specimen will have a permeability index between 850 and 1,300? (Round your answer to four decimal places.) P(850 < x < 1,300) = 0.8186 (b) If the permeability index is to be determined for each specimen in a random sample of size 10, how likely is it that the sample mean permeability index will be as follows? (i) between 900 and 1,200 (Round your answer to four decimal places.) P(900 < x < 1,200) = X (ii) between 850 and 1,300 (Round your answer to four decimal places.) = 0.9992 P(850 < x < 1,300)
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