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# Mean

Bernoulli distribution expected value.

The expected value for a Bernoulli random variable is

where `p`

is the success probability.

## Installation

`npm install @stdlib/stats-base-dists-bernoulli-mean`

## Usage

`var mean = require( '@stdlib/stats-base-dists-bernoulli-mean' );`

#### mean( p )

Returns the expected value of a Bernoulli distribution with success probability `p`

.

```
var v = mean( 0.1 );
// returns 0.1
v = mean( 0.5 );
// returns 0.5
```

If provided a success probability `p`

outside of `[0,1]`

, the function returns `NaN`

.

```
var v = mean( NaN );
// returns NaN
v = mean( 1.5 );
// returns NaN
v = mean( -1.0 );
// returns NaN
```

## Examples

```
var randu = require( '@stdlib/random-base-randu' );
var round = require( '@stdlib/math-base-special-round' );
var mean = require( '@stdlib/stats-base-dists-bernoulli-mean' );
var v;
var i;
var p;
for ( i = 0; i < 10; i++ ) {
p = randu();
v = mean( p );
console.log( 'p: %d, E(X;p): %d', p.toFixed( 4 ), v.toFixed( 4 ) );
}
```

## Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

#### Community

## License

See LICENSE.

## Copyright

Copyright © 2016-2024. The Stdlib Authors.