神马作文网1.In a survey of 3630 college students,1162 stated that they
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1.In a survey of 3630 college students,1162 stated that they cheated on an exam.If two students are randomly selected,find the probability that they both cheated on the exam.
2.In a game of dice,a play receives $5 if the sum of dots on the dice is 4,$8 if the sum of the dots on the dice is 10.Otherwise the player loses $2.Find the expected value of the net gain of the palyer.
第一题是概率,第二题是期望.紧急!最好有解题过程.
2.In a game of dice,a play receives $5 if the sum of dots on the dice is 4,$8 if the sum of the dots on the dice is 10.Otherwise the player loses $2.Find the expected value of the net gain of the palyer.
第一题是概率,第二题是期望.紧急!最好有解题过程.
（1）
C（1162,2）/C（3630,2）= 0.1024
（2）
全部可能性有6x6=36种
总和是4的情况记顺序有‘（1,3）,（3,1）,（2,2）’
P（a）=3/36=1/12
总和是10的情况记顺序有（4,6）（6,4）（5,5）
P（b）=3/36=1/12
总和是其他点的概率为：1-（1/12+1/12）=5/6
期望E=5×1/12+8x1/12+（-2)x5/6=-7/12
有不解的可以问我 祝学习愉快
C（1162,2）/C（3630,2）= 0.1024
（2）
全部可能性有6x6=36种
总和是4的情况记顺序有‘（1,3）,（3,1）,（2,2）’
P（a）=3/36=1/12
总和是10的情况记顺序有（4,6）（6,4）（5,5）
P（b）=3/36=1/12
总和是其他点的概率为：1-（1/12+1/12）=5/6
期望E=5×1/12+8x1/12+（-2)x5/6=-7/12
有不解的可以问我 祝学习愉快
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