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A manufacturer of batteries offers a two-year limited warranty. If the battery fails for any reason during the first two years, it is replaced. The time to failure, T, has the density function f(t)=te^(-(t^2)/a) for t >0.
(a) If a = 2
1) What percentage of the batteries is expected to fail within the warranty period?
2) The manufacturing cost of a battery is $75, and the profit per sale is $25 at the time of sale, i.e, the selling price is $100. What is the effect of warranty replacements on profit if during the warranty period a failed battery is replaced at no cost to the customer?
(b) What value of is required for a net profit of $10 per sale?
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The standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
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A researcher is interested in estimating noise levels in decibels at area urban hospitals. She wants to be 90% confident that her estimate is correct. If the standard deviation is 4.13, how large a sample is required to get the desired information..
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