Different results BigQuery and Tableau

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Hello guys when i try to calculate median and average in my BigQuery and Tableau i get different results even though I am using same numbers and rows. Is there something I should know?

For example;

In BiQuery

select district, avg(sales) from table name

In Tableau

Using district as dimension and select average of sales from the maxcard drop down menu.

Surprisingly the output from the two are not the same.

Any one knows what might be a problem that I should know?

Thanks!

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