Conditional Probability

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Question 1
Medium60%

There are only red marbles and green marbles in a bag. There are 6 red marbles and 4 green marbles.

Mason takes at random a marble from the bag. He does not put the marble back in the bag.

Mason takes at random a second marble from the bag.

a.

Complete the probability tree diagram.

A probability tree diagram for two marbles. The first marble has two branches: Red and Green, each with a dotted line for probability. The second marble has four branches: Red, Green, Red, and Green, each with a dotted line for probability.

[2]
b.

Work out the probability that Mason takes two marbles the same colour.

[4]

Conditional Probability Questions

  1. GCSE
  2. /Maths
  3. /Conditional Probability