Steps to reproduce

1.  Create an ABn test and expose it to some traffic. Wait until the data pipeline processed the data and results start showing up.
2.  Manually calculate the conversion rates for each variant from the data in the ab-testing-data table: conversion_rate = converted / visited * 100
3. Compare the manually calculated conversion rates with the ones in the result tab.

Expected results

The manually calculated conversion rates matches the ones in the result tab.

Actual results

The conversion rates in the result tab differ from the manually converted ones.

Workaround

None

Anlysis

The data pipeline calculates the conversion rate by the formula conversion_rate = converted / (visited + converted) * 100. This is caused by an incorrectly querying for all events in the formula's divisor instead of just the visited events.