<commit_before># Mean

> [Beta][beta] distribution [expected value][expected-value].


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## Usage<commit_msg>Add equation<commit_after># Mean

> [Beta][beta] distribution [expected value][expected-value].


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The [expected value][expected-value] for a [beta][beta] random variable is

<!-- <equation class="equation" label="eq:expectation" align="center" raw="\mathbb{E}\left[ X \right] = \frac{\alpha}{\alpha+\beta}" alt="Expected value for a beta distribution."> -->

<div class="equation" align="center" data-raw-text="\mathbb{E}\left[ X \right] = \frac{\alpha}{\alpha+\beta}" data-equation="eq:expectation">
    <img src="" alt="Expected value for a beta distribution.">
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where `α > 0` is the first shape parameter `β > 0` is the second shape parameter.

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## Usage
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