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In 2013 the number of cars sold by all the Chevrolet dealers in the United States closely approximated a normal distribution with a mean of 4,500 and a standard deviation of 600 cars. What percent of Chevrolet dealers sold (a) more than 5,000 cars, (b) fewer than 5,000 cars, (c) more than 3,000 cars, (d) fewer than 3,000 cars, (e) between 3,000 and 5,000 cars, (f) between 5,000 and 5,750 cars? Write the formula, plug the correct numbers in the formula, show your work, and circle your answer.
The Department of Finance provided the following information regarding the new retail jobs created in a sample of 5 cities in 2009.
Assume the life of these light bulbs follows a normal distribution. Find the probability that a random sample of 100 light bulbs will have an average life between 1760 and 1775 hours.
Download the data on the cumulative number of AIDS cases reported in the United States and its age-range breakdown. Draw a pie chart of the data.
Manufacturing and Product Development A manufactured glass rod is tested for the stress required for fracture. Experiments suggest that a flame-polished.
The scores on an undergraduate Statistics exam are normally distributed with a mean of 75 and a standard deviation of 8. What is the probability that a randomly selected student scores between 70 and 80 on this exam?
Suppose you are drawing cards out of a 30 card deck. The following table reports the value of each type of card and the frequency of each type.
A college found that 20% of its students withdraw without completing the introductory statistics course. Assume that 20 students registered for the course.
Find the? least-squares regression line treating weight as the explanatory variable and miles per gallon as the response variable.
four people are randomly from a group consisting of six men and six women. what is the probability that the group will
If the true mean is .9660 with a standard deviation of 0.0060 within what interval will 98% of the sample mean fall? (round to 4 decimal places
Two automatic dispensing machines are being considered for use in a fast-food chain. The first dispenses an amount of liquid that has a normal distribution with a mean of 11.9 ounces and a standard deviation of 0.07 ounces.
Duplicate the steps used in the proof of Theorem 8 to prove Chebyshev's theorem for a discrete random variable X.
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