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苏科版九上数学课件4.2_等可能条件的概率(一)(1)_图文

初中数学课件
灿若寒星*****整理制作

初中数学 九年级(上册)
4.2 等可能条件下的概率(一)(1)

4.2等可能条件下的概率(一)(1)
甲袋中装有6个相同的小球,它们分别写有1、2、3、4、5 、6,从口袋中随机地取出1个小球,编号是奇数与编号 是偶数这两个事件中,哪个事件发生的可能性大呢?
乙袋中装有9个相同的小球,它们分别写有1、2、3、4、5 、6、7、8、9,从口袋中随机地取出1个小球,编号是 奇数与编号是偶数这两个事件中,哪个事件发生的可能 性大呢?
把两袋中的球分别搅匀,从哪个袋中任意取出1个球,恰 好编号是偶数的可能性大?

4.2等可能条件下的概率(一)(1)
一般地,如果一个试验有n个等可能的结果,当其中 的m个结果之一出现时,事件A发生,那么事件A 发生的概率是多少呢?
等可能条件下的概率的计算方法:P( A) ? m n
(其中m表示事件A发生可能出现的结果数,n表示 一次试验所有等可能出现的结果数.)

4.2等可能条件下的概率(一)(1)
?例1 一只不透明的袋子中装有3个白球和2个 红球.这些球除颜色外都相同,拌匀后从中任 意摸出1个球. (1)会出现哪些等可能的结果? (2)摸到白球、摸到红球的概率各是多少?

4.2等可能条件下的概率(一)(1)
?例2 某班级有30名男生和20名女生,名字彼此 不同.现有相同的50张小纸条,每名学生分别 将自己的名字写在纸条上,放入一个盒子中, 搅匀后从中抽出1张纸条.比较“抽到男生名字 ”与“抽到女生名字”的概率的大小.
(1)本题若以“摸球”情境为背景,该如何 设计试验呢?
(2)能否对变换后的“摸球”试验再简化?

4.2等可能条件下的概率(一)(1)


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