### Information:

**Environment**

- Gomez Synthetic Monitoring - Backbone

- Synthetic Monitoring Backbone

**Symptoms**

**Solution**

Q. Does Gomez calculate average response times with a geometric mean or a arithmetic mean?

A. **Arithmetic mean**

Q. Does Gomez calculate an average of averages? For instance, do they calculate the response times for an hour, then average those hourly means to get the daily mean?

A. **No. We add all the response times from successful tests for a given time period, then divide the sum by the number of successful tests.**

Q. Are failed tests included in the response time average?

A. **Failed tests have a response time of 0.0 seconds.**

**A test with a zero response time is not included in the average calculation, which is an arithmetic mean of all tests given over the breakdown period specified:****If a data point happens at every hour, the point will be the average of all tests in that hour****If the chart is for the last day, the average will be (sum(every test with response time > 0)/(total number of tests with response time > 0)), and not an average of the data points.**

**As such, a the response time of a failed test is not included in the average response time calculation.**

**Root Cause**