Sum = Average (Arithmetic Mean) * No of observation
Sum_1 = 20*4 = 80
Sum_2 = 10*6 = 60
Sum = 80 + 60 = 140
Average = 140/10 = 14
if the arithmetic mean of four numbers is 20 and the arithmetic mean of other six numbers is 10 then,find the arithmetic mean of all the numbers taken as one group
1 answer
1 answer