Question

The sum of 12 numbers is 144. what is their average?

Answer 1

let x1, x2, x3,..........,x12 be the 12 no.s

given that,

x1+x2+x3+............+x12=144

then, average = (sum of the observations/no. of observations)

average= (x1+x2+x3+.........+x12)/12 = 144/12 =12

∴ average = 12