Connect-AzAccount

$vms = Get-AzVm

$Report = @()
foreach ($vm in $vms) {

	$rid = $vm.id

	$cpu = Get-AzMetric -ResourceId $rid -TimeGrain 00:15:00  -StartTime 2019-09-22T12:00:00Z -EndTime 2019-09-28T23:59:59Z -WarningAction silentlyContinue

	$curAvg = 0
	$max = 0
	$n = 1

	foreach ($c in $cpu.data){

		if($c.average -gt $max){
			$max = $c.average
		}

		if($c.average -gt 0){

			$curAvg = $curAvg + ($c.average - $curAvg)/$n
			$n = $n + 1
		}
	}

	$Object = New-Object System.Object
	$Object | Add-Member -type NoteProperty -name "Id" -Value $rid
	$Object | Add-Member -type NoteProperty -name "AveCpu" -Value $curAvg
	$Object | Add-Member -type NoteProperty -name "MaxCpu" -Value $max
	$Object | Add-Member -type NoteProperty -name "Count" -Value $n

	if($curAvg -gt 0){
		$Report += $Object
	}
}