Sunday
March 26, 2017

Post a New Question

Posted by on .

You have two bags of marbles.

Bag 1 has 5 red and 6 blue marbles.
Bag 2 has 20 green and 5 red marbles.

What is the probability of drawing a red marble out of Bag 2, given that you drew a red marble out of Bag 1?

  • conditional probability - ,

    5/25 = 1/5

    It makes no difference what color she drew from Bag 1.

  • conditional probability - ,

    P(R1)=5/11
    P(R2)=5/25

    Since the drawing of the two bags are independent, we have
    P(R1∩R2)=P(R1)*P(R2)

    P(R2|R1)=P(R2∩R1)/P(R1)
    =P(R1)*P(R2)/P(R1)
    =P(R2)
    =1/5 as Ms.Sue had it.

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question