The mean (also know as average), is obtained by dividing the sum of given values by the number of observations.
Mean= Sum of given values / Number of observations
Mean = where n is the number of observations.
In this picture, there are 6 numbers. So, number of observations is 6. Sum of 6 numbers = 11+12+18+23+25+7 = 96
So, Mean = = 16.
Now, solve the following problems below.
The mean score of 5 boys is 37 and that of a group of girls is 42. The mean of the total is 39.92. Now, calculate the number of girls present there .