Question

media aritmetica a lui 100 ; 40 ; 39 ; 11

Answer 1

(100+40+39+11)/4
190/4=47,5

Answer 2

$M _{a}=\frac{(a+b+c+....+a_{n}) }{n} \\ \\ M _{a}= \frac{(100+40+39+11}{4}= \frac{190}{4}=47,5$