## Question

###### An electrical firm manufactures light bulbs that have a length life X with normal distribution, and a standard deviation of 0 10 hours_ Find the sample size n required for the error to be less than 5 hours with 90% confidence_

An electrical firm manufactures light bulbs that have a length life X with normal distribution, and a standard deviation of 0 10 hours_ Find the sample size n required for the error to be less than 5 hours with 90% confidence_

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