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CBSE Class 9 Answered

mean......
Asked by harshitalohia | 05 Feb, 2010, 08:05: PM
answered-by-expert 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

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Answered by | 06 Feb, 2010, 10:18: AM

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