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OR. 1-20%*10%=0.98 (水城百事)

by OR, Wednesday, January 27, 2010, 16:53 @ 考考你的智力

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明天上午李明要参加奥运志愿者活动，为了准时起床，他用甲、乙两个闹钟叫醒自己，假设甲闹钟准时响的概率是0.80，乙闹钟准时响的概率是0.90，则两个至少有一个响的概率是多少? - 考考你的智力 ; 10-01-27,10:12 (#12522) Reply (水城百事)
- 72% - 太简单了 ; 10-01-27,10:33 (#12525) Reply
  - 不对吧 - 应该是98% ; 10-01-27,10:59 (#12528) Reply
    - 点解 - ？ ; 10-01-27,11:56 (#12532) Reply
      - 90% + （10% × 80%）= 98% - 简单 ; 10-01-27,13:24 (#12537) Reply
        
        80%+(20%*90%)=0.98 - 266 ; 10-01-27,13:38 (#12539) Reply
- 都对 - 考考你的智力 ; 10-01-27,13:42 (#12540) Reply
  - OR. 1-20%*10%=0.98 - OR ; 10-01-27,16:53 (#12549) Reply

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