Q. 104.1( 54 Votes )
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Answer :
Let Karishma got 'a' marks.
And assumed mean be 'a'.
We know,
Arithmetic mean, 
Where, a is assumed mean.
As, deviations given are -8, -6, -3, -1, 0, 2, 3, 4, 6
Sum of deviations = -8 + (-6) + (-3) + (-1) + 0 + 2 + 3 + 4 + 6
= -3
As, arithmetic mean of marks is 15
Putting values in formula, We have,
⇒ 15 = a - 0.3
⇒ a = 15.3
⇒ Karishma got 15.3 marks
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