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const currentTiming = pm.response.responseTime;

let totalTiming = pm.globals.get("timings");

let array;

// If postman variable is empty it is an empty string
if (totalTiming.length === 0) {
   // This is the case for the first or single request
   totalTiming = currentTiming;
   array = [totalTiming];
} else {
   totalTiming = `${totalTiming},${currentTiming}`;
   array = totalTiming.split(',');
}

pm.globals.set("timings", totalTiming);

let sumOfArray = 0;

for (let i = 0; i < array.length; i++) {
   sumOfArray += Number(array[i]);
}

const average = sumOfArray / (array.length);

pm.test(`Response timings: Average = ${average.toFixed(2)}, Max = ${Math.max(...array)}, Min = ${Math.min(...array)}`, function () {
   pm.expect(pm.response.responseTime).to.be.above(0);
});