Mathematics, 18.07.2020 18:01 pedrojsq271

An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 50 hours. How large a sample is need if we wish to be 95% confident that we will be within 12 hours of the true mean?

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An electrical firm manufactures light bulbs that have a length of life that is approximately normall...