一个求概率的数学题:If a certain coin is flipped,the possibility that
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一个求概率的数学题:If a certain coin is flipped,the possibility that the coin will land heads is 1/2.If the coin is flipped 5times,what is the possibility that it will land heads up on the first 3 flips and not on the last 2 flips?
分步原理 意思是前三次有图案 后两次不出现图
3次不出图0.5^3=1/8 出图1-1/8=7/8
后2次不出1/4
∴概率P=7/8*1/4=7/32
还是说题目意思就是前3次图后两次字 那么每轮概率都是1/2
1/2^5=1/32
再问: 答案是1/32
再答: 那题意就是前三次都是图 后2次都是字
3次不出图0.5^3=1/8 出图1-1/8=7/8
后2次不出1/4
∴概率P=7/8*1/4=7/32
还是说题目意思就是前3次图后两次字 那么每轮概率都是1/2
1/2^5=1/32
再问: 答案是1/32
再答: 那题意就是前三次都是图 后2次都是字
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