搜搜考试网一道概率英文题 急!（要解题步骤）
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一道概率英文题 急!（要解题步骤）
in an experiment involving toxic substance ,the probability that a white mouse will survive for 5 hours and the probabillity that a black mouse will survive after 5hours .
assuming independence what is the probability that at the end of 5 hours ?
a, both mice will survive (a 47% b,49% c 48% d 46% )
b, only the black mice will survive (a 32% b,25% c 33% d 35% )
c, both mice will not survive (a 12% b,13% c 14% d 8% )
我根本就没明白题的意思
这是道解答题 三个大问题 不是选择题哦 呵呵
in an experiment involving toxic substance ,the probability that a white mouse will survive for 5 hours and the probabillity that a black mouse will survive after 5hours .
assuming independence what is the probability that at the end of 5 hours ?
a, both mice will survive (a 47% b,49% c 48% d 46% )
b, only the black mice will survive (a 32% b,25% c 33% d 35% )
c, both mice will not survive (a 12% b,13% c 14% d 8% )
我根本就没明白题的意思
这是道解答题 三个大问题 不是选择题哦 呵呵
in an experiment involving toxic substance ,the probability that a white mouse will survive for 5 hours and the probabillity that a black mouse will survive after 5hours _________________
这道题不全,后面应该给出的是两种老鼠的存活率（横线上应填的是“are __ and __ ,respectively”）
不过,结合3个选项,我反推回去了,白鼠的存活率是60%,黑鼠的存活率是80%
这样,由于是独立事件（“assuming independence”）,所以答案分别为
a.0.6*0.8=0.48=48%,选c (两只老鼠都存活）
b.0.8*(1-0.6)=32%,选a (只有黑鼠存活）
c.(1-0.6)*(1-0.8)=8%,选d (两只老鼠都死亡）
这道题不全,后面应该给出的是两种老鼠的存活率（横线上应填的是“are __ and __ ,respectively”）
不过,结合3个选项,我反推回去了,白鼠的存活率是60%,黑鼠的存活率是80%
这样,由于是独立事件（“assuming independence”）,所以答案分别为
a.0.6*0.8=0.48=48%,选c (两只老鼠都存活）
b.0.8*(1-0.6)=32%,选a (只有黑鼠存活）
c.(1-0.6)*(1-0.8)=8%,选d (两只老鼠都死亡）