Solution
(A)
First five prime numbers are {2,3,5,7,11}
Mean = {2+3+5+7+11} / 5 = 5.6
(A) - (III)
(B)
All factors of 24 are {1,2,3,4,6,8,12,24}
Mean = (1+2+3+4+6+8+12+24) / 8 = 60 / 8 = 7.5
(B) - (II)
(C)
First 6 multiples of 4 = {4,8,12,16,20,24}
Mean = (4+8+12+16+20+24) / 6 = 14
(C) - (IV)
(D)
Mean = [(x-5y) + (x-3y) + (x-y) + (x+y) + (x+3y) + (x+5y)] / 6 = 12
6x / 6 = 12
x = 12
(D) - (I)
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