Question

aflați media aritemeti a a 3 numere știind ca doua au media aritmetica 14,5.21,4 respectiv 15. Va roggg repede dau corana​

Answer 1

(a+b+c)/3=x => a+b+c=3x

(a+b)/2=14,5

(b+c)/2=21,4

(a+c)/2=15

a+b=2*14,5=29

b+c=2*21,4=42,8

a+c=2*15=30

2a+2b+2c=29+42,8+30=101,8

2(a+b+c)=101,8

a+b+c=101,8/2=50,9

Deci media aritmetica este:

(a+b+c)/3=50,9/3=16,96...

Sper ca am ajutat