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20 questions
There are 10 counters in a bag, 3 red and 7 blue.
I take one counter, then another without replacement.
Find the probability of the value marked x
7/10
3/10
6/9
2/9
There are 10 counters in a bag, 3 red and 7 blue.
I take one counter, then another without replacement.
Find the probability of the value marked y
7/10
3/10
6/9
2/9
There are 10 counters in a bag, 3 red and 7 blue.
I take one counter, then another without replacement.
Find the probability of the value marked w
7/10
3/10
6/9
2/9
There are 10 counters in a bag, 3 red and 7 blue.
I take one counter, then another without replacement.
Find the probability of picking two red counters.
6/90
5/19
47/90
2/9
There are 10 counters in a bag, 3 red and 7 blue.
I take one counter, then another without replacement.
Find the probability of picking one of each colour counters.
21/90
48/90
42/90
10/19
A game is played where a fair coin is flipped.
Heads you lose, tails you get to flip again.
On the second go heads you lose and tails you win.
What is the probability of losing on the first go?
1/2
1/4
3/4
1
A game is played where a fair coin is flipped.
Heads you lose, tails you get to flip again.
On the second go heads you lose and tails you win.
What is the probability of losing on the second go?
1/2
1/4
3/4
1
A game is played where a fair coin is flipped.
Heads you lose, tails you get to flip again.
On the second go heads you lose and tails you win.
What is the probability of winning?
1/2
1/4
3/4
1
A game is played where a fair coin is flipped.
Heads you lose, tails you get to flip again.
On the second go heads you lose and tails you win.
What is the probability of losing?
1/2
1/4
3/4
1
There are 8 counters in a bag, 1 is red.
I take one counter, replace it, then take another.
What is the probability of taking a red counter on the first go?
1/8
7/8
1/7
6/7
There are 8 counters in a bag, 1 is red.
I take one counter, replace it, then take another.
What is the probability of taking a red counter on the second go?
1/8
7/8
1/7
6/7
There are 8 counters in a bag, 1 is red.
I take one counter, replace it, then take another.
What is the probability of taking two red counters?
1/8
1/64
2/8
2/64
What proportion of senior boys play football or wrestle?
9/143
12/143
18/143
39/143
How many senior boys play neither sport?
9
104
30
39
What proportion of senior boys play football and wrestle?
9/143
21/143
30/143
39/143
The diagram shows the sports played by 80 students.
If a student is picked at random, what is the probability that they play football only?
66/80
4/80
18/80
49/80
The diagram shows the sports played by 80 students.
If a student is picked at random, what is the probability that they play all three sports?
31/80
45/80
62/80
67/80
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