Aptitude | Progressions | Question 3

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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