the mean of 20 observations is 18 and the mean of other 30 observations is 22. Find the mean of all these 50 observations
Answers
Answered by
12
Given :
Total number of observations : 50
Mean of 20 observations : 18
Mean of 30 observations : 22
To find :
The mean of all those observations.
Solution :
We know that, the means of 20 and 30 observations seperataly are 18 and 22 respectively. So, first we should find the sum of observations that we get while finding the mean seperataly.
Sum of 20 observations :
Sum of 30 observations :
Now, we can find the mean of all the observations together.
Mean of all observations :
Hence, the mean of all the observations is 20.4.
Similar questions