# gcse probability

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#1
every now and then in a maths paper, we get a question which sounds like "sam did an experiment to try to decide if a coin is biased (then we are presented with the relative frequency) "It then says "Is the coin biased? Give a reason for your answer"
My questions is what error interval or like values would be accepted to be classified as 'fair'
such as 40% heads and 60% tail?
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1 year ago
#2
Fair is 50 50
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#3
(Original post by Dinu1004)
Fair is 50 50
yea thats pretty obvious but its not always going to be 50 50 (thats the expected probability) but very often its like 48 52. So in an exam what values would be accepted as 'fair'
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1 year ago
#4
At A-level, you're taught how to assess the confidence or reliability in estimates such as these as they depend on the number of experiments. For example, if the numbers 48-52 are obtained from 100 experiments, there is little evidence that they're biased. From 1,000,000 experiments, its likely that 48-52 is based and in the long run you would have an advantage / disadvantage.

At GCSE, you'll not be required to be numerical evidence. It should be fairly obvious about whether it would be biased or fair.

Do you have a specific question in mind.
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