iGCSE Mathematics (0580) :E8.6 Calculate conditional probability using Venn diagrams, tree diagrams and tables.iGCSE Style Questions Paper 2

Question

A group of 200 people were asked which city they would like to visit next.
The table shows the results.


(a) A person from the group is chosen at random.
Write down the probability that this person would like to visit either Paris or Tokyo next.
………………………………………….
(b) Two people are chosen at random from the group of 200.
Find the probability that one person would like to visit London next and the other person would like to
visit New York next.
Give your answer as a percentage.
…………………………………….. %

Answer/Explanation

(a)\( \frac{94}{200}\)
(b) 14.1 or 14.07…

Question

If it rains today the probability that it will rain tomorrow is 0.4 .
If it does not rain today the probability that it will rain tomorrow is 0.2 .
On Sunday it rained.
(a) Complete the tree diagram for Monday and Tuesday.

Answer/Explanation

Ans: 0.6 0.2 0.8 in correct places 

(b) Find the probability that it rains on at least one of the two days shown in the tree diagram.

Answer/Explanation

Ans: 0.52 oe nfww 

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