adds beta-binomial mean and test cases #5175
Merged
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Note that the get_moment method returns an integer value (rounding the mean down to the nearest integer) in this implementation. Probably due to multiplying an integer with floats..
This is made clear in two of the test cases, where np.floor is applied to the expected output. This is similar to the implementation of the Binomial mean (also a integer multiplied with a float, and where the test cases are also rounded to integer values) so I figured it would be OK. Let me know otherwise!
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