(本小题满分12分)某工厂师徒二人各加工相同型号的零件2个,是否

(本小题满分12分)某工厂师徒二人各加工相同型号的零件2个,是否加工出精品均互不影响.已知师父加工一个零件是精品的概率为,师徒二人各加工2个零件都是精品的概率为(I)求徒弟加工2个零件都是精品的概率;

(II)求徒弟加工该零件的精品数多于师父的概率;

答案

解:Ⅰ、徒弟加工一个精品零件的概率为

[所以徒弟加工2个零件都是精品的概率是

Ⅱ、设徒弟加工零件的精品多于师父的概率为,由Ⅰ知,。师父加工的两个零件中,精品个数的分布如下:

0

1

2

P

徒弟加式的两个零件中,精品个数的分布如下:

0

1

2

P

所以

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