Q. 45.0( 1 Vote )

If the mean of the f

Answer :


we know, 
Mean =
= 21.5
21.5 (15 + k) = 255 + 35k
322.5 + 21.5k = 255 + 35k
35k - 21.5k = 322.5 - 255
13.5k = 67.5
∴ k = = 5

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