Question

Aflati media aritmetica a 10 nr. rationale stiind ca media aritmetica a primelor 2 e 5, media aritmetica a urmatoarelor 3 nr e 25 iar media aritmetica a ultimelor 5 nr e 200

Answer 1

ma1=(a+b+c+d+e+f+g+h+i+j)/10

ma2=(a+b)/2=5

a+b=2*5
a+b=10

ma3=(c+d+e)/3=25

c+d+e=3*25
c+d+e=75

ma4=(f+g+h+i+j)/5=200

f+g+h+i+j=200*5

f+g+h+i+j=1000

ma1= (10+75+1000)/10= 1085/10= 108,5

Answer 2

(a+b) : 2= 5
a+b=2x5= 10

(c+d+e) : 3 =25
c+d+e =25x3 = 75

(f+g+h+i+j) : 5=200
f+g+h+i+j=200x5=1000

(10+75+1000) : 10 =
1085:10 = 108, 5