Question

The mean of 15 observations is 10 and that of another 10 observations is 5. Find the mean of all 25 observations

Answer 1

Answer:

Step-by-step explanation:

sum of first 15 observations =mean*no of observations=15*10=150

similarly , the sum of another10 observations=10*5=50

mean all 25 observations=(150+50)/(15+10)=8