Find the Arithmatic mean of series: 10, 7, 4, 1, -2
(A)
13/2
(B)
14/3
(C)
4
(D)
16/5
Answer: (C)
Explanation:
Arithmatic Mean = (a1+a2+a3+……+an)/n =(n(a1+an)/2)/n =a1+a2/2 =10-2/2 = 4
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