Question

In: Statistics and Probability

We have 3 boxes. Box A contains 1 yellow ball and 2 red balls. Box B...

We have 3 boxes. Box A contains 1 yellow ball and 2 red balls. Box B conatins 2 yellow balls and 2 red balls. Box C contains 2 yellow balls and 1 red ball. First, we randomly choose between Box A and Box B. Then we randomly choose a ball from the selected box and put the ball into Box C. Lastly, we randomly choose a ball from Box C.

Let E1 be the event that Box A is chosen first. Let E2 be the event that the first ball chosen is red. Let E3 be the event that the last ball chosen is red.

Find P(E2/E3)

Solutions

Expert Solution

We first compute here all the outcomes when E3 is occurring:

  • E1, E2 and E3: First box chosen is A, the ball from first box chosen is red, and the last ball chosen is red.
    Prob. = 0.5*(2/3)*0.5 = 1/6
  • not E1, E2 and E3: First box chosen is B, the ball from first box chosen is red, and the last ball chosen is red.
    Prob. = 0.5*(2/4)*0.5 = 1/8
  • E1, not E2 and E3: First box chosen is A, the ball from first box chosen is not red, and the last ball chosen is red.
    Prob. = 0.5*(1/3)*(1/4) = 1/24
  • not E1, not E2 and E3: First box chosen is B, the ball from first box chosen is not red, and the last ball chosen is red.
    Prob. = 0.5*(2/4)*(1/4) = 1/16

Therefore, we have here:
P(E3) = (1/6) + (1/8) + (1/24) + (1/16) = (8 + 6 + 2 + 3)/48 = 19/48

P(E2 and E3) = (1/6) + (1/8) = 7/24

Therefore the conditional probability now is computed using Bayes theorem here as:
P(E2 | E3) = P(E2 and E3) / P(E3) = (7/24) / (19/48) = 14/19

Therefore 14/19 = 0.7368 is the required probability here.


Related Solutions

We have 3 boxes. Box A contains 1 yellow ball and 2 red balls. Box B...
We have 3 boxes. Box A contains 1 yellow ball and 2 red balls. Box B contains 2 yellow balls and 2 red balls. Box C contains 2 yellow balls and 1 red ball. First, we randomly choose between Box A and Box B. Then we randomly choose a ball from the selected box and put the ball into Box C. Lastly, we randomly choose a ball from Box C. Let E1 be the event that Box A is chosen...
We have 3 boxes. Box A contains 1 yellow ball and 2 red balls. Box B...
We have 3 boxes. Box A contains 1 yellow ball and 2 red balls. Box B conatins 2 yellow balls and 2 red balls. Box C contains 2 yellow balls and 1 red ball. First, we randomly choose between Box A and Box B. Then we randomly choose a ball from the selected box and put the ball into Box C. Lastly, we randomly choose a ball from Box C. Let E1 be the event that Box A is chosen...
We have 3 boxes. Box A contains 1 yellow ball and 2 red balls. Box B...
We have 3 boxes. Box A contains 1 yellow ball and 2 red balls. Box B conatins 2 yellow balls and 2 red balls. Box C contains 2 yellow balls and 1 red ball. First, we randomly choose between Box A and Box B. Then we randomly choose a ball from the selected box and put the ball into Box C. Lastly, we randomly choose a ball from Box C. Let E1 be the event that Box A is chosen...
Box A contains 6 red balls and 3 green balls, whereas box B contains 3 red...
Box A contains 6 red balls and 3 green balls, whereas box B contains 3 red ball and 15 green balls. Stage one. One box is selected at random in such a way that box A is selected with probability 1/5 and box B is selected with probability 4/5. Stage two. Finally, suppose that two balls are selected at random with replacement from the box selected at stage one. g) What is the probability that both balls are red? h)...
Box 1 contains 3 red balls, 5 green balls and 2 white balls. Box 2 contains...
Box 1 contains 3 red balls, 5 green balls and 2 white balls. Box 2 contains 5 red balls, 3 green balls and 1 white ball. One ball of unknown color is transferred from Box 1 to Box 2. (a) What is the probability that a ball drawn at random from Box 2 is green? (b) What is the probability that a ball drawn from Box 1 is not white?
A box contains 4 red balls, 3 yellow balls, and 3 green balls. You will reach...
A box contains 4 red balls, 3 yellow balls, and 3 green balls. You will reach into the box and blindly select a ball, take it out, and then place it to one side. You will then repeat the experiment, without putting the first ball back. Calculate the probability that the two balls you selected include a yellow one and a green one. 3. Consider a binomially distributed random variable constructed from a series of 8 trials with a 60%...
3. Box A contains 6 red balls and 3 green balls, whereas box B contains 3...
3. Box A contains 6 red balls and 3 green balls, whereas box B contains 3 red ball and 15 green balls. Stage one:One box is selected at random in such a way that box A is selected with probability 1/5 and box B is selected with probability 4/5. Stage two: First, suppose that 1 ball is selected at random from the box selected at stage one. a) What is the probability that the ball is red? b) Given that...
Following are three boxes containing balls. Box #1 contains 2 black balls and 1 white ball....
Following are three boxes containing balls. Box #1 contains 2 black balls and 1 white ball. Box #2 contains 2 black balls and 2 white balls. Box #3 contains 1 black ball and 2 white ball. Draw a ball from Box 1 and place it in Box 2. Then draw a ball from Box 2 and place it in Box 3. Finally draw a ball from Box 3 . What is the possibility that the last ball drawn, from Box...
We have 3 bowls, 1) The first bowl contains 3 red and 2 green balls 2)...
We have 3 bowls, 1) The first bowl contains 3 red and 2 green balls 2) the second bowl contains 2 red and 1 white balls 3) the third one contains 1 red and 3 green balls One bowl by the random is selected and then 2 balls will be drawn. what is the probability that both of these balls will be red?
We have 3 bowls, 1) The first bowl contains 3 red and 2 green balls 2)...
We have 3 bowls, 1) The first bowl contains 3 red and 2 green balls 2) the second bowl contains 2 red and 1 white balls 3) the third one contains 1 red and 3 green balls One bowl by the random is selected and then 2 balls will be drawn. what is the probability that both of these balls will be red?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT