Enter the probability of an event occurring and the number of trials into the calculator to determine the expected value.

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## Expected Value Formula

The following formula is used to calculate an expected value.

EV = P(x) * n

- Where EV is the expected value of the expected number of successes
- P(x) is the probability of event x occurring
- n is the number of trials

## FAQ

**What is an expected value?**

An expected value is the total expected value given a certain probability of a value occurring and a certain number of trials.

## Expected Value Example

How to calculate an expected value?

**First, determine the probability of the even happening.**This will be the probability of a given value, or the probability or a given even. For this example we will say there is a 25% chance of an event occurring.

**Next, determine the number of trials.**For this example we will say there will be 100 trials.

**Finally, calculate the expected value.**Calculate the expected number of events given the 25% chance and the 100 trials, so 100*.25 = 25 total expected.

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