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

(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)

:

step-by-step explanation:

hi! i think the answer is 1/2 : )