Question

marks (above) :- 10 20 30 40 50 number of students:- 20 15 11 9 5
find the arithmetic mean

Answer 1

10+20+30+40+50/5=150/5=3
20+15+11+9+5 /5=60/5=12

Answer 2

x= 10,20,30,40,50
f=20,15,11,9,5


xf=200,300,330,360,250
xf=1440

mean=) xf/f
1440/60

=)24
mean =) 24