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Answer to Question #326802 in Statistics and Probability for heis

Question #326802

1.    The guaranteed average life of a certain type of electric light bulbs is       1000 hours with a standard deviation of 125 hours. It is decided to sample the output to ensure that 90 percent of the bulbs do not fall short of the  guaranteed average by more than 2.5%. What must be the minimum size of the sample?



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