Arithmetic mean of marks (out of 25) scored by 10 students was 15 one of the student named krishma enquired The Other 9 students and find the diviations form her marks are noted as -8,-6,-3,-1,0,2,3,4,6 find karishma marks
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let karishma marks = x
as per question , deviations from her marks = -8,-3,-6,-1,0,2,3,4,6
and mean of 10 students : 15
this implies ATQ
{ (x-8)+(x-3)+(x-6)+(x-1)+x+(x+2)+(x+3)+(x+4)+(x+6) } / 10 = 15
on solving
x = 17
thus karishma marks = 17 out of 25
as per question , deviations from her marks = -8,-3,-6,-1,0,2,3,4,6
and mean of 10 students : 15
this implies ATQ
{ (x-8)+(x-3)+(x-6)+(x-1)+x+(x+2)+(x+3)+(x+4)+(x+6) } / 10 = 15
on solving
x = 17
thus karishma marks = 17 out of 25
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