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The average income tax refund for 2009 tax year was $3095. Assumes the refund per person follows the normal probability distribution with a standard deviation of $922. Round all answers 4 decimal places.
A. The probability that a randomly selected tax return refund will be more then $2100 is?
B. The probability that a randomly selected tax return refund will be between $1400 and $2000 is?
C. The probability that a randomly selected tax return refund will be between $3300 and $4400 is?
D. What refund amount represents the 35th percentile of tax returns?
the thickness of a flange on an aircraft component is uniformly distributed between 0.95 and 1.05 millimeters.a
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A power of 0.2203 can be interpreted to mean there is a 22.03% chance of selecting a sample whose sample mean is larger than 166.3 lb.
Calculate the mean and standard deviation and determine the number of standard deviations the most extreme cost is away from the mean
Statistical questions tend to fall into what two main categories?
The sample mean of the number of spots on the 6000 rolls, should be about If this die is rolled 6000 times, the number of times we get a 2 or a 3 should be about
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The lengths of 225 fish caught in Lake Michigan had a mean of 15.0 inches. Assume that the population standard deviation is 2.5 inches.
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