Business Studies, asked by krupanshu3874, 11 months ago

An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation of 40 hours. Test the hypothesis that = 800 hours against the alternative, = 800 hours, if a random sample of 30 bulbs has an average life of 788 hours. Use a p-value in your answer

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Answered by kishan2247

1

haa I don't know..... .sorry

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