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June 2013 p62 q7
2937
Susan has a bag of sweets containing 7 chocolates and 5 toffees. Ahmad has a bag of sweets containing 3 chocolates, 4 toffees and 2 boiled sweets. A sweet is taken at random from Susan’s bag and put in Ahmad’s bag. A sweet is then taken at random from Ahmad’s bag.
The random variable X is the number of times a chocolate is taken. State the possible values of X and draw up a table to show the probability distribution of X.
Solution
The possible values of the random variable X are 0, 1, and 2.
To find the probability distribution, consider the following cases:
1. P(X = 0): No chocolates are taken. This occurs if a toffee or boiled sweet is taken from Susan's bag and then a toffee or boiled sweet is taken from Ahmad's bag.