Question

Media aritmetica a numerelor 4,8 5,14 si x este egala cu 8,1.Determinati-l pe x

Answer 1

ma=(4+8+5+14+x):5=8,1
$\frac{4+8+5+14+x}{5} =8,1$
4+8+5+14+x=8,1×5 ⇒ 
  x= 8,1×5-4-8-5-14⇒
 x=9,5

Answer 2

$m_{a}= \frac{4+8+5+14+x}{5}=8,1 \\ m_{a}= \frac{31+x}{5}=8,1 \\ m_{a}=31+x=8,1*5 \\ m_{a}=31+x=40,5 \\ x=40,5-31 \\ x=\boxed{9,5}$