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Q: Why the probability can never be 1 or less than 0?

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0 means there is no chance of something happening. You cannot have less than no chance of something happening. So a probability cannot be less than 0.

Probability can not be less than 0 or greater than 1. A probability of 0 means there is no possibility whatsoever of an event occurring. A probability of 1 means that the event is guaranteed to occur no matter what.

No. A probability of 1 means something will definitely happen. There cannot be a greater certainty than that, so probability cannot be greater than 1. 0 means there is no chance of something happening. You cannot have less than no chance of something happening. So a probability cannot be less than 0.

Probability values are never negative and are always between 0-1 according to the definition Probability of A= Number of outcomes classified as A/Total number of possible outcomes

0 represents that is will never happen. It means that there is no probability that it will happen. 1 represents that is is certain to happen. You cannot be more certain than definitely certain, and something cannot be less probable than not at all.

No, all probabilities are given from a scale of 0 to 1. 0 represents 0% and 1 represents a 100% probability.

No. Probability must be between 0 and 1.

If you have a sperm amount less than 3 ml the probability decreases. No, sorry to say but all it takes is one sperm. On the other hand when testing for paternity the test is never 0, it can be close to it but never zero, due to the + or - error in the mathematical formula used.

No, it must be a number in the interval [0, 1].

Probability value can only be real number between 0 to 1, therefore, it cannot be greater than 1 or less than 0 or a complex number.

Larger or equal to 0 but less than or equal to 1

From the related link, you can read directly the probability that Z is less than 1.51 is 0.9345.

There is insufficient information in the question to properly answer it. You did not provide the list of "the following". Please restate the question. However, by definition of probability, a probability less than 0 (the event will never happen) or greater than 1 (the event will always happen) is impossible, so maybe that answers your question.

certainty (no doubt), probability or likelihood (greater than 50% chance), possibility (greater than 0% but less than 50% chance)

Because probability is measured from zero to one, where zero means something cannot happen and one meaning it will definitely happen. This can also be looked at as there being a 0% chance or 100% chance of it happening. So obviously there can not be less of a chance than it definitely not happening, so it cannot be less than zero.

There are many such events. The probability of throwing a 1 or 2 on one roll of a die, for example.

probability is 43.3%

Yes, a probability of 0 is something that cannot happen.

ifan event has a probability of zero it'll never happen. 6 over 0 will never happen.

Probability is defined in such a way that 0 (or 0%) means that something is impossible to happen, and 1 (or 100%) means that the event is inevitable. Anything in between means that it MAY happen. Anything outside that range doesn't make sense.

It depends on what the "something" is. The probability that the roll of a regular die will never exceed 6 is 1. The probability that the roll of a regular die will never exceed 3 is 0.5. The probability that the roll of a regular die will never exceed 0 is 0.

No. Probability is measured on a score of 0 to 1, which represents 0% (can never happen) to 100% (always happens).

you would have a one third chance :0)

A probability can be no larger than 1 and no smaller than 0.

Probabilities are expressed as ratios, or more accurately, fractions. If an event will probably occur 1 time in 10 trials, its probability is 1/10, or 0.1. If the event happens every time (10 in 10, for example), the probability is 10/10 = 1.0. You can never have more than n occurrences in n trials. Conversely, if the event never occurs in 10 trials, its probability is 0/10 = 0.0. An event cannot occur fewer than 0 times. This is why the lower and upper bounds of all probabilities are 0 and 1, respectively.