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21 May, 06:08

The average (arithmetic mean) of k scores

is 20. The average of 10 of these scores

is 15. Find the average of the remaining

scores in terms of k.

(A) 20k + 150/10

(B) 20k - 150/10

(C) 150-20k/10

(D) 150 - 20k/k-10

(E) 20k - 150/k-10

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Answers (1)
  1. 21 May, 09:57
    0
    (E) (20k - 150) / (k - 10)

    Step-by-step explanation:

    Sum of all scores = average * number of scores = 20 * k = 20k

    Sum of 10 scores = 15 * 10 = 150

    Sum of remaining scores = 20k - 150

    Number of remaining scores = k - 10

    Average of remaining scores = sum of remaining/no. remaining

    = (20 k - 150) / (k-10)
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