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An automatic hopper car loader is set to put 75 tons of coal into each car. The actual weights of coal loaded into each car vary according to normal distribution with mean 75 tons and standard deviation 0.8 ton.
A. What is the probability that the average load of 20 cars chosen at random will be less than 74.5 tons?
B. What is the probability that a car chosen at random will have less than 74.5 tons of coal?
The proportion of drivers who use seat belts depends on things like age, gender, ethnicity, and local law. As part of a broader study, investigators observed a random sample of 117 female Hispanic drivers in Boston; 68 of these drivers were wearin..
Using z-scores, a population with mean = 37 and standard deviation = 8 is standardized so that the new mean is mean = 50 and standard deviation = 10. How does an individual's z-score in the new distribution compare with his/her z-score in the orig..
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the mean weight of loads of rock is 49.0 tons with a standard deviation of 12.0 tons. if 9 loads are chosen at random
Let X be net income of the AirCanada from the above described random experiment. Compute the probability function of X.
With the exponential function e^x and logarithmic function log x how do I graphically show the effect if x is doubled?
Nitrogen and Seagrass. The seagrass Thalassia testudinum is an integral part of the Texas coastal ecosystem. Essential to the growth of T. testudinum is ammonium.
an airline sells 250 tickets for a certain flight that only has 245 seats. on averageabout 2 of ticket purchasers do
At the .01 level of significance, is there sufficient evidence to conclude that a difference exists between the mean number of volunteer hours per week for male and female college students?
For the new study, the estimate should be within 1% of the population proportion with a 90 percent confidence level. What is the necessary sample size?
Why is it necessary to study the order of operations and the laws of operations before you start solving equations? Of the three laws, commutative, associative, and distributive, which one is most frequently used in algebra? Why?
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