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Mathematics 12 Online
UKKhan:

In a random sample of 64 light bulbs, the mean lifetime was 1217 hours with sample standard deviation of 52 hours. a. Calculate a two-sided 96% confidence interval for the mean lifetime of this type of light bulb. b. If the true population mean lifetime is 1210, what is the approximate probability that the average lifetime of 64 randomly selected light bulbs is greater than 1217?

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