Question

if there are two group with 40 observation and 60 observation with arithmetic means 120 and 80 respectively, the combined arithmetic mean of 100 observation is

Answer 1

Answer:

The answer is 54

Step-by-step explanation:

x/30=50

x=50×30

x=1500

y/20=60

y=60×20

y=1200

x+y/50=1500+1200/50

=2700/50

Combined mean is 54