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A researcher wants to know the lifetime of the BL brand lamp. For the research needs, it takes 9 lamps to be tested. The experimental

A researcher wants to know the lifetime of the "BL" brand lamp. For the research needs, it takes 9 lamps to be tested. The experimental results show an average lifetime of 1,500 hours with a standard deviation of 111 hours. Calculate E (X ); variance X and standard deviation(X ) of the average lamp life under test!

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