Mathematics, 07.08.2019 03:30 starswarsfan

An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 40 hours. if a sample of 30 bulbs has an average life of 780 hours, how large a sample is needed if we wish to be 96% conﬁdent that our sample mean will be within 10 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...