Why is my search not producing an average in the resulting stats table?

Hello Splunk Ninjas I'm trying to create a SPL query that displays the avg and max response time. When I run my search, only the max values are displayed. How do I edit my search to fix this? index=my_index sourcetype=my_sourcetype| stats avg(Response_Time), max(Response_Time) by service | table avg(Response_Time), max(Response_Time) | sort -max(Response_Time) ![alt text][1] [1]: /storage/temp/154172-response-time.jpg