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1 # Average or Mean
2
3 > This query is available as `average` and `mean`.
4
5 An average is a single number taken as representative of a list of numbers.
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7 It is calculated as:
8
9 ```
10 average = sum(numbers) / count(numbers)
11 ```
12
13 ## how to use
14
15 Use it in alerts like this:
16
17 ```
18 alarm: my_alert
19 on: my_chart
20 lookup: average -1m unaligned of my_dimension
21 warn: $this > 1000
22 ```
23
24 `average` does not change the units. For example, if the chart units is `requests/sec`, the result
25 will be again expressed in the same units.
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27 It can also be used in APIs and badges as `&group=average` in the URL.
28
29 ## Examples
30
31 Examining last 1 minute `successful` web server responses:
32
33 - ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=min&after=-60&label=min)
34 - ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=average&after=-60&label=average&value_color=orange)
35 - ![](https://registry.my-netdata.io/api/v1/badge.svg?chart=web_log_nginx.response_statuses&options=unaligned&dimensions=success&group=max&after=-60&label=max)
36
37 ## References
38
39 - <https://en.wikipedia.org/wiki/Average>.
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