AVERAGE CONCEPT:
In Traditional way an average can be defined as sum of observations by total no of observations
when comes to competitive exam it can be defined as an equal distribution that means if a class having 10 students have an average score of 50 means each one will be having 50 irrespective of their individual scores when someone entering into the class making an increment in the average score means that is the contribution to that particular person
another definition for the averages is sum of all deviations is equal to zero.
model problems:
In Traditional way an average can be defined as sum of observations by total no of observations
when comes to competitive exam it can be defined as an equal distribution that means if a class having 10 students have an average score of 50 means each one will be having 50 irrespective of their individual scores when someone entering into the class making an increment in the average score means that is the contribution to that particular person
another definition for the averages is sum of all deviations is equal to zero.
model problems:
| 1.A student needed to find the arithmetic mean of the numbers 3, 11, 7, 9, 15, 13, 8, 19, 17, 21, 14 and x. He found the mean to be 12. What is the value of x? | |
| sol:SUM OF DEVIATIONS=0 9+1+5+3-3-1+4-7-5-9-2+12-x=0 x=7 | |
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