I'm assuming that when you say 'fair number', you're talking about the saying "A fair number of people think...", correct?
In that sense, there really is no hard and fast rule about what a fair number is. It's basically a saying to mean a considerable portion of a whole.
For instance, if you were to say "A fair number of people are unhappy with the senator's policies," you're saying that there is a large percentage of the people in the state he was elected in don't agree with him, without giving an exact number.
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When a fair die is thrown the probability that a prime number will occur is 2:1
The probability of getting an odd number in a single throw of a fair die (not dice!) is 1/2.The probability of getting an odd number in a single throw of a fair die (not dice!) is 1/2.The probability of getting an odd number in a single throw of a fair die (not dice!) is 1/2.The probability of getting an odd number in a single throw of a fair die (not dice!) is 1/2.
The probability that the number rolled, on a fair, six sided die, will be greater than 4 is 1/3.The probability that the number rolled, on a fair, six sided die, will be greater than 4 is 1/3.The probability that the number rolled, on a fair, six sided die, will be greater than 4 is 1/3.The probability that the number rolled, on a fair, six sided die, will be greater than 4 is 1/3.
1/8
A single roll of a fair number cube: 1/2 A single toss of a fair coin: 1/2 Both events: 1/4