Running mean filtering using Window Functions?

<div class="WordSection1"><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif"">Hi,</span><pclass="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif""> </span><pclass="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif"">canI realize a running mean filter using window functions?</span><p class="MsoNormal"><span
lang="EN-US"style="font-size:11.0pt;font-family:"Times New Roman","serif""> </span><p class="MsoNormal"><span
lang="EN-US"style="font-size:11.0pt;font-family:"Times New Roman","serif"">What I can think of is:</span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif""> </span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif"">SELECT avg(random)
OVER(PARTITION BY floor(time_s / 60) ORDER BY floor(time_s / 60)) </span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif"">FROM (</span><p class="MsoNormal"><span lang="EN-US"
style="font-size:11.0pt;font-family:"TimesNew Roman","serif"">SELECT generate_series(0,600,20) time_s,
random()</span><pclass="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif"">)
asdata;</span><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif""> </span><pclass="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif"">whichaverages all measurements in one minute, but not every line with its following two lines.</span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif""> </span><p
class="MsoNormal"><spanlang="EN-US" style="font-size:11.0pt;font-family:"Times New Roman","serif"">Any
suggestions?</span><pclass="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif""> </span><pclass="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif"">Bestregards</span><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times
NewRoman","serif"">Andreas</span><p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Times New
Roman","serif""> </span><pclass="MsoNormal"><span
style="font-size:10.0pt">___________________________________________________________________________</span><p
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style="font-size:10.0pt">SCANLAB AG</span><pclass="MsoNormal"><span
style="font-size:10.0pt">Dr. Andreas Simon Gaab</span><pclass="MsoNormal"><span style="font-size:10.0pt">Entwicklung •
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