Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 87 tons of coal into each car. The actual weights of coal loaded into each car are normally distributed, with mean u = 87 tons and standard deviation o = 1.1 ton. (a) What is the probability that one car chosen at random will have less than 86.5 tons of coal? (Round your answer to four decimal places.) (b) What is the probability that 20 cars chosen at random will have a mean load weight x of less than 86.5 tons of coal? (Round your answer to four decimal places.) (c) Suppose the weight of coal in one car was less than 86.5 tons. Would that fact make you suspect that the loader had slipped out of adjustment? O Yes O No Suppose the weight of coal in 20 cars selected at random had an average x of less than 86.5 tons. Would that fact make you suspect that the loader had slipped out of adjustment? Why? Yes, the probability that this deviation is random is very small. O Yes, the probability that this deviation is random is very large. O No, the probability that this deviation is random is very small. O No, the probability that this deviation is random is very large.

Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 87 tons of coal into each car. The actual weights of coal loaded into each car are normally distributed, with mean u = 87 tons and standard deviation o = 1.1 ton. (a) What is the probability that one car chosen at random will have less than 86.5 tons of coal? (Round your answer to four decimal places.) (b) What is the probability that 20 cars chosen at random will have a mean load weight x of less than 86.5 tons of coal? (Round your answer to four decimal places.) (c) Suppose the weight of coal in one car was less than 86.5 tons. Would that fact make you suspect that the loader had slipped out of adjustment? O Yes O No Suppose the weight of coal in 20 cars selected at random had an average x of less than 86.5 tons. Would that fact make you suspect that the loader had slipped out of adjustment? Why? Yes, the probability that this deviation is random is very small. O Yes, the probability that this deviation is random is very large. O No, the probability that this deviation is random is very small. O No, the probability that this deviation is random is very large.

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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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

Question

Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic hopper car loader is set to put 87 tons of coal into
each car. The actual weights of coal loaded into each car are normally distributed, with mean u = 87 tons and standard deviation o = 1.1 ton.
(a) What is the probability that one car chosen at random will have less than 86.5 tons of coal? (Round your answer to four decimal places.)
(b) What is the probability that 20 cars chosen at random will have a mean load weight x of less than 86.5 tons of coal? (Round your answer to four decimal places.)
(c) Suppose the weight of coal in one car was less than 86.5 tons. Would that fact make you suspect that the loader had slipped out of adjustment?
O Yes
O No
Suppose the weight of coal in 20 cars selected at random had an average x of less than 86.5 tons. Would that fact make you suspect that the loader had slipped out
of adjustment? Why?
Yes, the probability that this deviation is random is very small.
O Yes, the probability that this deviation is random is very large.
O No, the probability that this deviation is random is very small.
O No, the probability that this deviation is random is very large.

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