Find the length of a 90% confidence interval for the mean of the sample with a population standard deviation of 10 when the sample size is 125. O a 294 O b. 1.65 O c 4 60 Od 3.51 The standard deviation of the life expectancy of an inkjet printer is 3 years. How many printers must be tested in order to be 95% confident that the error of estimate will not exceed 1 year? O a 20 Ob 34 35 Od 21

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