kaaludega varustatud suuruste väärtuste/mõõdiste aritmeetiline keskmine, mean what is defined as the sum of their products divided by the sum of their weights, sum of the products of each value and its weight (which can be positive or zero) of measurement divided by the sum of the weights of measurement, iga väärtuse/mõõdise ja selle kaalu (mis võib olla positiivne või null) korrutiste summa jagatud kaalude summaga