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You score an 82 on your econ exam and a 86 on your math exam. Econ exams had a mean of 72 and a standard deviation of 5 and the math exam had a mean of 68 with a standard deviation of 12. Which exam did you do better on?
Statistics and Probability, Statistics
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The revenue function R(x) and the cost function C9X) for a particular product are given. These functions are valid for the specified range of values. Find the number of units that must be produced to break even. R(x) =20 ...
How would I calculate this: Anystate Auto Insurance Company took a random sample of 382 insurance claims paid out during a 1-year period. The average claim paid was $1590. Assume σ = $234. Find a 0.90 confidence interv ...
It has been argued that although there may be more claims when road conditions are slippery in the winter, this should not affect the average claim. Malpeque took a sample of 50 claims from the winter of 2018 and found t ...
Mort is to pay off a loan of $75,000 with equal payments at the end of every month over 10 years (i.e., 120 months). The ANNUAL effective rate is 5%. Mort decides that he can actually manage to pay double the monthly pay ...
Suppose a retailer claims that the average wait time for a customer on its support line is 179 seconds. A random sample of 57 customers had an average wait time of 169 seconds. Assume the population standard deviation fo ...
Consider a machine with exponential reliability model. Assume that the breakdown rate is 1 and the repair rate is 2. Calculate the probability that the machine is up for more than 10 units of time. Calculate the probabil ...
Leprosy, also called Hansen's disease, is a disease produced by infection with a bacterium called Mycobacterium leprae. It has a long incubation period (time between getting infected and developing the disease), usually ...
Shekhar plans to invest $1,820 in a mutual fund at the end of each of the next six years. If his opportunity cost rate is 8 percent compounded annually, how much will his investment be worth after the last annuity paymen ...
Plastic sheets made by a machine are periodically monitored for fluctuations in thickness. If the true standard deviation in thickness exceeds 2.0 millimeters, there is cause for concern about product quality. Past exper ...
A survey found that people keep their televisions an average of 5.8 years. The standard deviation is 0.76 year. If a person decides to buy a new TV, find the probability that he or she owned the old one for the given amo ...
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