system.cpu.util on windows get 101.66667%(avg1) or 100.3333%(avg5) if cpu util is 100% for 1 minute.

in src/zabbix_agent/cpustat.c

---

/* Calculate average cpu usage */
for(n = pcpus->cpu[i].h_usage_index, j = 0, sum = 0; j < MAX_CPU_HISTORY; j++, n--)
{
if(n < 0) n = MAX_CPU_HISTORY - 1;

sum += pcpus->cpu[i].h_usage[n];

if(j == 60) /* cpu usage for last minute */

{ pcpus->cpu[i].util1 = ((double)sum)/(double)j; }

else if(j == 300) /* cpu usage for last five minutes */

{ pcpus->cpu[i].util5 = ((double)sum)/(double)j; }

}

---

variable "j" is start "0", "sum" is added 61 times when j == 60.