Question

URGENT!!
a) Calculati media aritmetica ponderata a numerelor 5 si $\frac{1}{5}$ cu ponderile 4 si 5.
b) Calculati media aritmetica ponderata a numerelor $\frac{1}{2} ; \frac{5}{4} ; \frac{3}{5} si \frac{1}{6}$ cu ponderile 2 ; 4 ; 5 ; 6

Answer 1

 $a)...\;m_p=\frac{5*4 + \frac{1}{5}*5}{4+5}=21/9=7/3\;;\\ b)...\;m_p=\frac{\frac{1}{2}*2+\frac{5}{4}*4+\frac{3}{5}*5+\frac{1}{6}*6}{2+4+5+6}=\\ =\frac{10}{17}\;;$