2014
Mathematics
67ca00ce0c643c71d77dee1f
The mean of 2 - t, 4 + t, 3 - 2t, 2 + t and t - 1 is
A.
t
B.
-t
C.
2
D.
-2
Correct Answer: 2
Explanation
Mean x = ∑x/n = [(2 - t) + (4 + t) + (3 - 2t) + (2 + t) + (t - 1)] ÷ 5 = [11 - 1 + 3t - 3t] ÷ 5 = 10 ÷ 5 = 2
Mean x = ∑x/n = [(2 - t) + (4 + t) + (3 - 2t) + (2 + t) + (t - 1)] ÷ 5 = [11 - 1 + 3t - 3t] ÷ 5 = 10 ÷ 5 = 2THIS WEEK's
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