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The average cell phone bill is 78 with a standard deviation of 10. What is the minimum percentage of cell phone bills that will be between 54 and 102?
Business Economics, Economics
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If material hardness is normally distributed with a mean of 42 and a standard deviation of 1. Specification limits for hardness are from 35 to 45. When the fraction defective is 0.0017 what is the corresponding PPM?
A cell phone company offers 15 different voice packages and 15 different data packages. Of those, 6 packages include both voice and data. How many ways are there to choose either voice or data, but not both?
In a random sample of 50 ?refrigerators, the mean repair cost was ?$146.00 and the population standard deviation is ?$17.80. Construct a 90?% confidence interval for the population mean repair cost. Interpret the results ...
"The current value of a company is $25 million. If the value of the company six year ago was $10 million, what is the company's mean annual growth rate over the past six years?" Please explain how the answer was reached ...
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