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What is the probability of obtaining a sample mean

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Question - Someone claims to have developed a new lightbulb whose mean lifetime is 1800 hours with a standard deviation of 100 hours. A sample of 100 of these bulbs is tested. The sample mean lifetime is 1770 hours. If the claim is true, what is the probability of obtaining a sample mean that is less than 1770 hours?

Reference no: EM132779360

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