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A manufacturer of electric fans claims that its fans have a mean life of 56 months with a standard deviation of 6 months.Suppose a consumer
A manufacturer of electric fans claims that its fans have a mean life of 56 months with a standard
deviation of 6 months.Suppose a consumer group decides to check the claim by purchasing a
sample of 49 electric fans and subjecting them to tests that determine battery life. If the manufacturer's
claim is true,what is theprobabilitythe consumer group's sample has a mean life of 54 or fewer
months?
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