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歡迎您訪問(wèn)數(shù)學(xué)考題練習(xí):如圖,用樹(shù)狀圖或列表法求兩個(gè)轉(zhuǎn)盤配成紫色的概率!

數(shù)學(xué)考題練習(xí):如圖,用樹(shù)狀圖或列表法求兩個(gè)轉(zhuǎn)盤配成紫色的概率

更新時(shí)間:2024-01-12 14:03:00作者:貝語(yǔ)網(wǎng)校

如圖,用樹(shù)狀圖或列表法求兩個(gè)轉(zhuǎn)盤配成紫色的概率.

試題答案

解:列表得:

(紅,黃)(黃,黃)(藍(lán),黃)(紅,黃)(黃,黃)(藍(lán),黃)
(紅,紅)(黃,紅)(藍(lán),紅)(紅,紅)(黃,紅)(藍(lán),紅)
(紅,紅)(黃,紅)(藍(lán),紅)(紅,紅)(黃,紅)(藍(lán),紅)
(紅,黃)(黃,黃)(藍(lán),黃)(紅,黃)(黃,黃)(藍(lán),黃)
(紅,藍(lán))(黃,藍(lán))(藍(lán),藍(lán))(紅,藍(lán))(黃,藍(lán))(藍(lán),藍(lán))
∴一共有30種等可能的結(jié)果,兩個(gè)轉(zhuǎn)盤配成紫色的有6種情況,

∴兩個(gè)轉(zhuǎn)盤配成紫色的概率為=.

試題解析

首先根據(jù)題意列表,然后由表格求得所有等可能的結(jié)果與兩個(gè)轉(zhuǎn)盤配成紫色的情況,然后利用概率公式求解即可求得答案.

點(diǎn)評(píng):此題考查了列表法或樹(shù)狀圖法求概率.注意列表法與樹(shù)狀圖法可以不重不漏的表示出所有可能的結(jié)果.用到的知識(shí)點(diǎn)為:概率=所求情況數(shù)與總情況數(shù)之比.

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