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2.Suppose the amount of light (in lumens) emitted by a particular brand of 40W light bulbs is normally distributed with a mean of 450 lumens

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2.Suppose the amount of light (in lumens) emitted by a particular brand of 40W light bulbs is normally distributed with a mean of 450 lumens and a standard deviation of 20 lumens. (a)What percentage of bulbs emit between 425 and 475 lumens? (b)What percentage of bulbs emit greater than 430 lumens

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