Q: If the probability that an event will happen is .25 or 25 percent what is the probability that it will not happen?

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The probability is 0.0035

5/20, 25%, or .25

No, not if it is a fair coin.

The probability of one event or the other occurring is the probability of one plus the probability of the other. The probability of getting 3 heads is the probability of 3 heads (1/23) multiplied by the probability of 4 tails (1/24) multiplied by the number of possible ways this could happen. This is 7c3 or 35. Thus the probability of 3 heads is 0.2734375. The probability of 2 tails is the probability of 2 tails (1/22) multiplied by the probability of 5 heads (1/25) multiplied by the number of ways this could happen. That is 7c5 or 21. Thus the probability of 2 tails is 0.1640625 The probability of one or the other is the sum of their probabilities: 0.1640625 + 0.2734375 = 0.4375 Thus the probability of getting 3 heads or 2 tails is 0.4375.

The probability of an event is easily calculated by dividing the number of squares that predict the event by the total number of squares. For example, if a man and woman were having a child, and the man was tall with brown hair and the woman short with blonde hair, the probability of the child being, say, tall with blonde hair, would be 1(number of squares with tall/blonde as a result) divided by 4(total number of squares), which is .25, or 25%

Related questions

On a scale of 1 to 0 it is a 0.25 probability chance that the event might happen

Yes, probability can be expressed as a percent. It is common to express probabilities as a percentage, which is calculated by multiplying the probability by 100. For example, if the probability of an event is 0.25, it can also be expressed as 25%.

0.25

By definition, the probability of an event is always some number between 0 and 1. Sometimes we think of these as percents. For example, if something has a probability of 25%, the probability is simply 25/100, or .25. By this definition, nothing can have probability 3 or 1.2, or any negative number whatsoever. Only probabilities between 0 and 1 (inclusive) are allowed.

The probability of the event is 25/36.

7 out of 25 times

The time for the event has passed so there is no need for a probability. It either did snow so the event was a certainty, or it did not and so it was not.

Astra - event - happened on 2010-04-25.

5/20, 25%, or .25

The probability is 0.0035

Probability is the frequency that something in particular will happen, expressed in ratio with the frequency of anything happening. For instance, if you say that the probability of something is 0.25, then you can expect, over the long run, that repeated trials will result in 25% of the desired results and 75% of the non desired results. A concrete example: In a standard deck of 52 cards, there are 12 face cards, the Jack, Queen, and King of Spades, Diamonds, Clubs, and Hearts. The probability of drawing a face card from a randomly shuffled deck is 12 in 52, or 3 in 13, or about 0.2308. Probability is always a number between 0 and 1. A probability of 0 means that the desired event will never happen, and a probability of 1 means that the desired event will always happen. A consequence of this definition is that, if you say that the probability of something happening is p, then the probability of that something not happening is 1 - p.

No, when you toss a coin there is a 50 percent chance it will land heads up.