Question

Aflati media aritmetica a urmatoarelor grupe de numere.
a)2,15.
-3,8
1,75
-1,23
b)patru numere egale cu 9 supra 20 si trei egale cu -2 supra 15

Answer 1

[tex]a)m_a=\frac{2,14+(-3,8)+1,75+(-1,23)}{4}= \frac{2,14-3,8+1,75-1,23}{4}= \frac{-1,14}{4}=-0,285\\ b) m_a= \frac{4* \frac{9}{20}+3*( \frac{-2}{15})}{7}= \frac{ \frac{9}{5}- \frac{2}{5}}{7}= \frac{ \frac{7}{5}}{7}= \frac{7}{7*5}= \frac{1}{5} [/tex]