Question

Numerele 0,1,2,3,4,5,6,7 apar intr-o distributie cu ponderile , respectiv 6,18,23,20,14,6,2,1 .Care este media aritmetica ponderata a numerelor date?

Answer 1

$\dfrac{0\cdot6+1\cdot18+2\cdot23+3\cdot20+4\cdot14+5\cdot6+6\cdot2+7\cdot1}{6+18+23+20+14+6+2+1}=\dfrac{229}{90}=2,5(4).$