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The U.S. Energy Information Agency reported that the mean monthly household electric bill in the United States in 2007 was $99.70. Assume the amounts are normally distributed with standard deviation $20.00.
Between what two values are the middle 60% of the bill amounts?
When writing about the probability that it will rain in Boston on July 4 of next year, a newspaper reporter states that the probability is ½, because either it will rain or it will not.
Suppose a random sample of 25 swatches are selected. What is the probability that the mean of the sample is less than 235 pounds per square inch.
How much should a healthy shetland pony weigh? Let X be the age of the ponies in months and y be the average weight of the ponies, in kilograms.
in order to check to see if the mean body temperature for human differs from 98.6 degree f. in the sample of 50 healthy
Florida State University administers a test of mathematics placement to students when they first enter the university.
At the .05 significance level can we conclude that there is more variation in the processing time of the new machine?
the life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standard
Find the system reliability for each of the following.: (b) Which has the higher reliability? How could you configure a system of such relays to bring RS(t) up to 0.999?
Determine the probability that a single light bulb lasts over 120 hours. (d) Could you use the CLT to approximate the distribution of the total lifetime of these bulbs?
peggy has drawn two cards from a standard dock and obtained an ace of clubs and a king of clubs. if peggy draws three
Researcher is interested in testing whether there are differences in mean between population one and population two.
We could then perhaps form a linear regression by charting the points of IQ for each person and their mother on a graph to determine if a correlation can be made between the IQ score of the individual and the IQ score of the mother. If the scores ..
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