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Suppose a manufacturing company makes a certain item. The time to produce each item is normally distributed around a mean of 27 minutes with a standard deviation of 2.5 minutes. Thus, the population of production times is normal in shape. Find the mean and standard deviation of the sample.
suppose diameters of trees in a particular forest are normally distributed with a mean of 18.4 inches and a standard
The average monthly electric bill of a random sample of 256 residents of a city is $90 with a standard deviation of $24.
1. a random sample of size 49 is drawn from a population with a standard deviation of 11. if only 18 of the time a
A random sample a 16 Google managers yield the following information on annual salaries. The sample mean is $69,000, with a sample standard deviation of $4,000. What is the mean salary of all Google managers?
The Statistical Abstract of the United States published by the US Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds.
A computer diskette manufacturer is concerned that some diskettes have bad sectors that would cause a diskette to hold less information than it was intended to hold.
in six test runs a truck operated 8 10 15 7 9 and 11miles with one gallon of gasoline. at the 95 level of confidence is
a survey from teenage research unlimited found that 30 of teenage consumers receive their spending money from part-time
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
Write a short paragraph explaining to the psychologist what can be concluded from this output (assuming the technical conditions are met).
With a major expansion planned, Judy projects sales next year to increase to 1,200 radials. What will the demand be each season? Please show work (formulas).
The mean score of a college entrance test is 500, the standard deviation is 75 and the scores are normally distributed.
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