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TOPModel Комплект за къдрене BEAUTY and ME 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 topmodel комплект за къдрева beast and me topmodel комплект за къдрева beauty and me