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问 题 问题 9 新教材增加了概率一章 ,提出以下问题 :1 )新教材第二册 (下Ａ)第 1 4 4页 1 8题 :某家庭电话在家中有人时 ,打进的电话响第一声时被接的概率为 0 .1 ,响第二声时被接的概率为 0 .3,响第三声时被接的概率为0 .4 ,响第四声时被接的概率为 0 .1 ,那么电话在
Question 9 The new textbook adds a chapter to the probability and asks the following questions: 1) New textbook 2 (Part A) Page 14 4 18 Question: When a family phone is in someone’s home, the incoming call rings first The probability of being connected when sound is 0 .1, the probability of being connected when sounding the second sound is 0.3, the probability of being answered when sounding the third sound is 0.4, and the probability of being answered when sounding the fourth sound is 0. .1, then the phone is in