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WorksheetsConditional Probability
Total questions: 8
Worksheet time: 10mins
This Venn diagram shows the results when 30 people were asked whether they have a cat or a dog.
Find the probability that a person selected at random has a cat given that they have a dog.
97
3017
167
2617
The two way table shows information about the gender and age of employees at a company.
A person from the company is chosen at random. Find the probability that the person is female given that they are 30 or over.
5728
3619
2819
3628
Lily has the following cards,
A A B B B C C D
Lily picks two cards. The first card is an A. Find the probability that the second card is also an A.
71
82
81
72
A football team contains 9 boys and 6 girls.
The coach is choosing players at random for a match.
The first player picked is a boy.
Find the probability that the second player picked is a girl.
156
86
146
148
Ben and Jacob randomly pick a packet of crisps from a multipack containing 6 packs of ready salted and 6 packs of cheese and onion. What is the probability they both pick a packet of ready salted crisps?
Give the answer in its simplest form.
41
245
113
225
Fred is a golf player. The probability that Fred gets a hole in one on a dry day is 0.2 and the probability that Fred gets a hole in one on a rainy day is 0.1. Fred is going to play golf tomorrow.
The probability that it will be raining is 0.7.
Find the probability that Fred will get a hole in one.
0.13
0.14
0.07
0.3
Vicky has a box of chocolates containing 5 white chocolates and 11 milk chocolates. Vicky eats one milk chocolate.
Find the probability that the next chocolate she picks is also a milk chocolate.
There are 8 counters in a bag. Three of the counters are red and the rest are blue. A counter is chosen at random. It is not replaced. A second counter is chosen at random.
Calculate the probability that both counters are blue.
