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 problem below.
In a test, the mean mark of 60 students of section A is 84 and that in section B is 76. If the mean of the total number of students is 80, how many students were present in section B?
- 58
- 60
- 57
- 59