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Probability distributions.

Binomial distributions.

are used

When a small number of samples are tested.

Poisson distributions

When

The probability of success depends on how large the number of attempts is.

requires know the average.

also used as an approximation

normal curve

Symmetric bell-shaped graph

IT IS?

The median and mode are located in the center.

We can do the same but on the opposite side.

The normal curve can also be viewed as a limiting case of the binomial.