For any randomized trial, some variation from the mean is expected, of course, but the randomization ensures that the experimental groups have mean values that are close, due to the central limit theorem and Markov's inequality.
Ring saka siki percobaan acak, wénten makudang  variasi saking rata-rata sané kaandelang, pastika sampun, sakéwanten pengacakan mastikayang indik kelompok eksperimen madué nilai rata-rata sané nampek dekat, santuka teorema limit pusat miwah ketidaksetaraan Markov.