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Klett 7 клас 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 Klett за The Evaristo Prize for African Poetry previously published poems? does the deadline day include 1 november submissions?