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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 2026年3月新政策直接受益上市公司 1 2026 ホークス91勝リーグ3連覇日本一2連覇39年前1987年の西武と同数 The Evaristo Prize for African Poetry previously published poems? does the deadline day include 1 november submissions?