Question
It has been determined that the useful life of an X-ray equipment has a normal distribution, with a mean of 320 months and a standard
It has been determined that the useful life of an X-ray equipment has a normal distribution, with a mean of 320 months and a standard deviation of 160 months. If a distributor has a stock of 30 machines.
a. What percentage of machines will last less than 120 months? (Round to 2 decimal places) Answer %
b. What percentage will last between 300 and 400 months? (Round to 2 decimal places)
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Sampling
Authors: Steven K Thompson
3rd Edition
111816296X, 9781118162965
