Coal: Automatic Loader Coal is carried from a mine in West Virginia to a power plant in
Question:
Coal: Automatic Loader 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 75 tons of coal into each car.
The actual weights of coal loaded into each car are normally distributed, with mean m 5 75 tons and standard deviation s 5 0.8 ton.
(a) What is the probability that one car chosen at random will have less than 74.5 tons of coal?
(b) What is the probability that 20 cars chosen at random will have a mean load weight x of less than 74.5 tons of coal?
(c) Interpretation Suppose the weight of coal in one car was less than 74.5 tons. Would that fact make you suspect that the loader had slipped out of adjustment? Suppose the weight of coal in 20 cars selected at random had an average x of less than 74.5 tons. Would that fact make you suspect that the loader had slipped out of adjustment? Why?
AppendixLO1
Step by Step Answer:
Understandable Statistics Concepts And Methods
ISBN: 9780357719176
13th Edition
Authors: Charles Henry Brase, Corrinne Pellillo Brase