The average (arithmetic mean) of k scores is 20. The average of 10 of these scores is 15. Find the average of the remaining

Question

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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Samantha 1 week 2021-09-15T01:27:02+00:00 1 Answer 0

Answers ( )

    0
    2021-09-15T01:28:58+00:00

    Answer:

    (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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