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A railroad car having a mass of 15 Mg is coasting at on a horizontal track. At the same time another car having a mass of 12 Mg is coasting at 0.75 m/s in the opposite direction. If the cars meet and couple together, determine the speed of both cars just after the coupling. Find the difference between the total kinetic energy before and after coupling has occurred, and explain qualitatively what happened to this energy.
Exponential distribution with a mean of 4 minutes. What is the probability that a person is served in less than 3 minutes on at least 4 of the next 6 days.
A survey found that at most 40% of those surveyed planned to get more sleep. A sample of 300 people found that 140 of them plan to get more sleep. For alpha = 0.01, what is the critical value?
if iq scores are normally distributed with a mean of 100 points and a standard deviation of 15 points what proportion
suppose that the demand for a companys product in weeks 1 2 and 3 are each normally distributed and the mean demand
What type of relationship exists between the flow rate and the change in temperature?
Twelve cases of leukemia are reported in people living in a particular census tract over a 5-year period. Is this number of cases abnormal if only 6.7 cases would be expected based on national cancer-incidence rates?
a horse race has 12 entries. assuming that there are no ties what is the probability that the three horses owned by one
The joint cumulative distribution function for (X, Y) is given by F(x, y) = ( 1 - e-x/ID - e-y/l + e-lx+SyJ/I0)/10,001 (x)I10,oodY).
let x be a random variable with mean 3 and variance 2 and let y be a random variable such that for every x the
a 95 confidence interval for a population mean u is given as 18.958 21.015. this confidence interval is based on a
Use these statistics to construct a 94% confidence interval for the mean monthly consumption for the population of all Ontario households.
astronomers estimate that as many as 100 billion stars in the milky way galaxy may be encircled by planets. let p
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