Question

Media aritmetica a 12 numere este de 23,15 iar media aritmetica a primelor 8 este 23,15 calculati media aritmetica a celorlalte 4 numere .varogg urgent

Answer 1

Fie x media aritmedtica a celorlalte 4 numere

atunci

Suma numereler=12*23,15=8*23,15+4*x

4*23,15=4*x

23,15=x

x=23,15

media aritmetica a celorlate 4 numere

as simple as that!!!

Answer 2

[tex] \frac{a_1+a_2+...+a_8+a_9+...+a_{12}}{12}=23,15\\ \\ \Rightarrow\,a_1+a_2+...+a_8+a_9+...+a_{12}=23,15\cdot12=\boxed{277,8}\\ \\ a_1+a_2+...+a_8= 23,15\cdot8=\boxed{185,2}\\ \\ a_9+a_{10}+a_{11}+a_{12}=277.8 - 185,2 =\boxed{92,6}\\ \\ \boxed{m_a= \frac{a_9+a_{10}+a_{11}+a_{12}}{4}=92,6:4=23,15} [/tex]