Mathematics, 13.11.2019 23:31 thalia17
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 69 tons of coal into each car. the actual weights of coal loaded into each car are normally distributed, with mean μ = 69 tons and standard deviation σ = 0.9 ton. what is the probability that one car chosen at random will have less than 68.5 tons of coal?
Answers: 1
Mathematics, 21.06.2019 19:40
Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.
Answers: 3
Mathematics, 22.06.2019 04:00
Betty correctly answers 30 questions on your math test there are 40 questions on the test what percent of the questions did she answered incorrectly
Answers: 1
Coal is carried from a mine in west virginia to a power plant in new york in hopper cars on a long t...
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