1. [T: 9.2] (15 pts) 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, find a 96% confidence interval for the population mean of all bulbs produced by this firm.
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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, find a $96 \%$ confidence interval for the population mean of all bulbs produced by this firm.
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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. find a $96 \%$ confidence interval for the population mean of all bulbs produced by this firm.
Ajiboye T.
"9.2 An electrical firm manufactures light bulbs that have length of life that is approximately distributed normally with standard deviation of' 40 hours. If sample of 30 bulbs has an average life of 780 hours, find 96% confidence interval for the population mean of all bulbs produced by this firm:"
Anna D.
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