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The test grades at a large school have an approximately normal distribution with a mean of 50. What is the standard deviation of the data so that 80% of the students are within 12 points (above or below) the mean?
A) 5.875B) 9.375C) 10.375D) 14.5E) Cannot be determined
A manufacturer claims that the life span of its tires is 52,000 miles. You work for a consumer protection agency and you are testing these tires. Assume the life spans of the tires are normally distributed.
Records also point to that interviewing committee of bank officers approves 85% of individuals they interview. Determine probability that Ann's loan request is approved.
A statistics instructor wants to know which route will get her to school the fastest. Each day from October 2 to November 15, when she gets to the turn point she checks the odometer on her car
Determine the relationships among data above? Analyze with charts/graphs/tables and a discussion.
The incubation time for Rhode Island Red chicks is normally distributed with a mean of 21 days and standard deviation of approximately 1 day.
Describe the types of decisions that do not involve uncertainty and risk and common approaches used for analyzying them.
A random sample of seven cars was selected; the cars were driven for two weeks without the booster and two weeks with the booster.
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
Search the Internet to find three applications of statistical concepts that you find interesting, that you encounter on a daily basis, or that you find in your profession.
The weight of a product is normally distributed with a standard deviation of .5 ounces. What should the average weight be if the production manager wants no more than 5 percent of the products to weight more than 5.10 ounces.
Dan Thompson, the president of CEO Airlines, recently noted an increase in the number of no-shows for flights out of Atlanta.
What is the probability that the student is both a sophomore and a history major?
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