Question

Determinati numarul x,asfel incat media aritmetica a numerelor 21;14,4;34,6 si x sa fie 29.

Answer 1

$\frac{21 + 14,4 + 34,6 + x}{3} = 29$

$21 + 14,4 + 34,6 + x = 29 \times 3$

$35,4 + 34,6 + x = 87 \\ 70 + x = 87\\ x = 87-70\\ x = 17$

Answer 2

Răspuns:

ma=(a+b)/2

ma=(21+14+4+34+6+x)/6

ma=(79+x)/6

ma=29 => (79+x)/6=29

79+x= 6*29

79+x=174

x=174-79

x=95