Answer to Question #323689 in Statistics and Probability for Klum

Question #323689

Two boxes, 1 and 2 are given. Suppose box 1 contains 6 black and 7 white balls. Box 2 contains 9 black and 8 white balls. Three balls are selected at random from box 1 and put into box 2. Then two balls are selected at random from box 2.

1) what is the probability that these two balls have the same color

2) what is the probability that these two balls have the different colors


1
Expert's answer
2022-04-08T12:50:46-0400

1:H1:www  from  box  1H2:wwb  from  box  1H3:wbb  from  box  1H4:bbb  from  box  1A:same  colorsP(H1)=C73C133=0.122378P(H2)=C72C61C133=0.440559P(H3)=C71C62C133=0.367133P(H4)=C63C133=0.0699301P(AH1)=[9b,11w]=C112+C92C202=0.478947P(AH2)=[10b,10w]=C102+C102C202=0.473684P(AH3)=[11b,9w]=C92+C112C202=0.478947P(AH4)=[12b,8w]=C82+C122C202=0.494737P(A)=P(AH1)P(H1)+P(AH2)P(H2)+P(AH3)P(H3)+P(AH4)P(H4)==0.4789470.122378+0.4736840.440559+0.4789470.367133+0.4947370.0699301==0.4777332:P(different)=1P(same)=10.477733=0.5222671:\\H_1:www\,\,from\,\,box\,\,1\\H_2:wwb\,\,from\,\,box\,\,1\\H_3:wbb\,\,from\,\,box\,\,1\\H_4:bbb\,\,from\,\,box\,\,1\\A: same\,\,colors\\P\left( H_1 \right) =\frac{C_{7}^{3}}{C_{13}^{3}}=0.122378\\P\left( H_2 \right) =\frac{C_{7}^{2}C_{6}^{1}}{C_{13}^{3}}=0.440559\\P\left( H_3 \right) =\frac{C_{7}^{1}C_{6}^{2}}{C_{13}^{3}}=0.367133\\P\left( H_4 \right) =\frac{C_{6}^{3}}{C_{13}^{3}}=0.0699301\\P\left( A|H_1 \right) =\left[ 9b,11w \right] =\frac{C_{11}^{2}+C_{9}^{2}}{C_{20}^{2}}=0.478947\\P\left( A|H_2 \right) =\left[ 10b,10w \right] =\frac{C_{10}^{2}+C_{10}^{2}}{C_{20}^{2}}=0.473684\\P\left( A|H_3 \right) =\left[ 11b,9w \right] =\frac{C_{9}^{2}+C_{11}^{2}}{C_{20}^{2}}=0.478947\\P\left( A|H_4 \right) =\left[ 12b,8w \right] =\frac{C_{8}^{2}+C_{12}^{2}}{C_{20}^{2}}=0.494737\\P\left( A \right) =P\left( A|H_1 \right) P\left( H_1 \right) +P\left( A|H_2 \right) P\left( H_2 \right) +P\left( A|H_3 \right) P\left( H_3 \right) +P\left( A|H_4 \right) P\left( H_4 \right) =\\=0.478947\cdot 0.122378+0.473684\cdot 0.440559+0.478947\cdot 0.367133+0.494737\cdot 0.0699301=\\=0.477733\\2: P\left( different \right) =1-P\left( same \right) =1-0.477733=0.522267


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