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## Calculate the average size of perf usage reports per computer
## Calculate the average data volume size of perf usage reports per computer
#### #avg #sort #barchart
<!-- article_id: 3107‎2017‏‎03827034 -->

This example calculates the average size of perf usage reports per computer, over the last 3 hours.
The results are shown in a bar chart.
```OQL
Usage
Perf
| where TimeGenerated > ago(3h)
| where DataType == "Perf"
| where QuantityUnit == "MBytes"
| summarize avg(Quantity) by Computer
| sort by avg_Quantity desc nulls last
| render barchart
```
| where _IsBillable == true
| summarize AvgBytes=avg(_BilledSize) by Computer | sort by AvgBytes desc
```