Question

A data set of n observations has mean 2 x. While another data set of 2n observations has

mean x . Then the mean of the combined data set of 3n observations will be :​

Answer 1

Answer:

mean =sum of observations/no of the observations

case1

2x= sum of observations/ n

sum of observations =2xn

case2

x=sum of observations/2n

sum of observations =2xn

case3

mean=sum of n observations +sum of 2n observations

______________________________________

n+2n

mean=2xn+2xn/3n

mean=4xn/3n

mean=4x/3