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One would use binomial distribution if and only if the experiment satisfies the following conditions

1. There is a fixed number of trials.

2. Each trial is independent of one another.

3. There are only two possible outcomes (a Success or a Failure).

4. The probability of success, p, is the same for every trial. An example of an experiment that has a binomial distribution would be a coin toss.

1. You would toss the coin a n (a fixed number) times.

2. The result of a a previous toss does not affect the present toss (trials are independent).

3. There are only two outcomes - Heads or Tails.

4. The probability of success (whether a head is considered a success or a tail is considered a success) is constant at 50%.

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Q: When do you use binomial distribution?
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