Question

A distribution consists of three groups having
40, 50 and 60 items with means 20, 26 and 15
respectively. The mean of the distribution is:
​

Answer 1

Answer:

Step-by-step explanation: we know the formula for combined mean I.e.sum(ni* xibar)/sum(ni)

Hencenfor given example

Mean of distribution is

((40*20)+(50*26)+(60*15))/(40+50+60)=20

Answer 2

Answer:

20

Step-by-step explanation:

mean of distribution=20