mean......
Asked by harshitalohia | 5th Feb, 2010, 08:05: PM
Expert Answer:
(z - x1) + (z - x2) +..........(z - x20) =
(z+z...+z...20 times) - (x1 + x2 +....+x20) =
(20z) - 20((x1 + x2 +....+x20)/20) = .............Multiply and divide by 20 in the second 'x' terms.
(20z) - 20(z) = 0 ........................since z = (x1 + x2 +....+x20)/20
Regards,
Team,
TopperLearning.
Answered by | 6th Feb, 2010, 10:18: AM
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