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The life of light bulbs is distributed normally. The variance of the lifetime is 400 and the mean lifetime of a bulb is 580 The life of light bulbs is distributed normally. The variance of the lifetime is 900 and the mean lifetime of a bulb is 580 book book от слънце книги за доброто book book от слънце кини за доброто book book от слънце киви за доброто