The mean of 13grades is 4.25 if one of the grades ,12.5 is deleted then the mean of the remaining 12 grades is
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Mean of 13 grades = 4.25
So, sum of all 13 grades = 13 * 4.25 = 55.25
Now, 12.5 is deleted...
Therefore, Sum of left 12 grades = 55.25 - 12.5
= 42.75......
Mean of 12 grades = 42.75/12 = 3.5625
So, sum of all 13 grades = 13 * 4.25 = 55.25
Now, 12.5 is deleted...
Therefore, Sum of left 12 grades = 55.25 - 12.5
= 42.75......
Mean of 12 grades = 42.75/12 = 3.5625
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