Definition of Probability Distribution:

A probability distribution is a table or an equation that links each outcome of a statistical experiment with its probability of occurrence.


Definition of Binomial Probability Distribution:

A binomial distribution is a specific probability distribution which is used to model the probability of obtaining one of two outcomes, a certain number of times (k), out of fixed number of trials (N) of a discrete random event.

Are there two definitions consistent with each other? I think no.

Why? Because, how is a Binomial Distribution acting like a table or equation that links each out come of the experiment with its probability of occurrence?

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    $\begingroup$ they are perfectly consistent. the binomial probability distribution gives you the probability of the number of successes in a set of n independent yes/no experiments, each one having identical probability of success p $\endgroup$
    – matteo
    Oct 4, 2016 at 20:51

2 Answers 2


You need to define what's an outcome. So, in case of Binomial distribution the outcome is "event occurred k times out of n trials". So you have a table with n+1 rows from 0 to n, each one representing one outcome, i.e. k occurrences of event. Each row will have a corresponding probability. Hence, the table of outcomes.


Imagine an experiment where you toss a coin $N$ times and count the number of heads that occurred. Imagine that the coin doesn't necessarily have to be fair and it can return heads with some probability $p$. Binomial distribution is a function parameterized by $p$ and $N$ that maps the number of heads that occurred, $k$, with probabilities. In here $p$ and $N$ are features of the experiment and $k$ is the outcome. So yes, it's consistent with the definition provided.


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