一道關(guān)于概率的英文數(shù)學(xué)題
一道關(guān)于概率的英文數(shù)學(xué)題
7) A box contains 3 red,4 white and 5 blue discs.Three discs are selected at random
from the box.Find the probability that:
a) all three discs are the same colour,if the selection is with replacement
b) all three discs are of different colours,if the selection is without replacement
翻譯人人都會
7) A box contains 3 red,4 white and 5 blue discs.Three discs are selected at random
from the box.Find the probability that:
a) all three discs are the same colour,if the selection is with replacement
b) all three discs are of different colours,if the selection is without replacement
翻譯人人都會
英語人氣:665 ℃時間:2020-10-02 00:50:25
優(yōu)質(zhì)解答
額````翻譯樓上的已經(jīng)做了,我就直接解答了.a、顏色相同有3種情況,我們要分別計算就是1/4*2/11*1/10+1/3*3/11*1/5+5/12*4/11*3/10=3/44就是這個概率啦~b、這個跟上面挺像的,就是有點(diǎn)麻煩1/4*4/11*1/2+1/4*5/11*2/5+1/...
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