Question

Daca media aritmetica a 10 numere este 23,61 si media aritmetica a patru dintre ele este 1,01 ,atunci media aritmetica a celorlalte 6 numere este?

Answer 1

Ma1=(x1+x2+x3+x4+x5+x6+x7+x8+x9+x10)/10

x1+x2+x3+x4+x5+x6+x7+x8+x9+x10=23.61*10

x1+x2+x3+x4+x5+x6+x7+x8+x9+x10=236.1

Ma2=(x1+x2+x3+x4)/4

x1+x2+x3+x4=4*1.01=4.04

Putem determina suma celor 6 nr ramase:

x5+x6+x7+x8+x9+x10=x1+x2+x3+x4+x5+x6+x7+x8+x9+x10-(x1+x2+x3+x4)=236.1-40.4=232.06

Ma3=(x5+x6+x7+x8+x9+x10)/6=232.06/6=38.67(6)