Generally you should express it as a number between 0 (impossible) and 1 (absolute certainty). Either as a decimal or fraction is OK. For example, the probability of a fair coin toss landing on heads is 0.5. The probability of a fair die landing on 4 is 1/6.
But it's also common to see probability written as a percentage between 0% (impossible) and 100% (absolute certainty). So P(coin landing on heads)=50.0% and P(die landing on 4)=16.7%.
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Probability questions are not all the same so there is not a single kind of answer: it depends on the nature of the question!
A spinner has the numbers 1 thru 9. What is the probability of P(less than 6)? Write the answer as a decimal.
The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.The complement (not compliment) of the probability of event A is 1 minus the probability of A: that is, it is the probability of A not happening or "not-A" happening.
1/6
No 1.001 is not a probability. Probability can not be >1