数学问题概率求解释Rework problem 28 from section 3.4 of your text, involving the drawing of twoballs from a box of colored balls. Assume the box contains 8 balls:3 red, 3 blue, and 2 yellow. A ball is drawn and its color noted. If the bal
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![数学问题概率求解释Rework problem 28 from section 3.4 of your text, involving the drawing of twoballs from a box of colored balls. Assume the box contains 8 balls:3 red, 3 blue, and 2 yellow. A ball is drawn and its color noted. If the bal](/uploads/image/z/2562944-32-4.jpg?t=%E6%95%B0%E5%AD%A6%E9%97%AE%E9%A2%98%E6%A6%82%E7%8E%87%E6%B1%82%E8%A7%A3%E9%87%8ARework+problem+28+from+section+3.4+of+your+text%2C+involving+the+drawing+of+twoballs+from+a+box+of+colored+balls.++Assume+the+box+contains+8+balls%3A3+red%2C+3+blue%2C+and+2+yellow.++A+ball+is+drawn+and+its+color+noted.++If+the+bal)
数学问题概率求解释Rework problem 28 from section 3.4 of your text, involving the drawing of twoballs from a box of colored balls. Assume the box contains 8 balls:3 red, 3 blue, and 2 yellow. A ball is drawn and its color noted. If the bal
数学问题概率求解释
Rework problem 28 from section 3.4 of your text, involving the drawing of two
balls from a box of colored balls. Assume the box contains 8 balls:
3 red, 3 blue, and 2 yellow. A ball is drawn and its
color noted. If the ball is yellow, it is replaced; otherwise, it is not.
A second ball is then drawn and its color is noted.
What is the probability that the first ball was yellow, given that the
second was red?
KEY IS 7/27
Anyone know the detailed process?
Thax!
数学问题概率求解释Rework problem 28 from section 3.4 of your text, involving the drawing of twoballs from a box of colored balls. Assume the box contains 8 balls:3 red, 3 blue, and 2 yellow. A ball is drawn and its color noted. If the bal
首先算出来取出第二个求是红球的概率:3/8*2/7+3/8*3/7+2/8*3/8=81/(28*8)
再算出第一次取出黄球第二次取出红球的概率:2/8*3/8=6/(8*8)
6/(8*8)除以81/(28*8)就是7/27
ps:中间数字太大我就没算结果了