Frequency distribution Quantitative Review PS 148

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El Cucu: Master | Next Rank: 500 Posts; Posts: 236; Joined: Fri Nov 28, 2008 9:16 am; Thanked: 9 times

Frequency distribution Quantitative Review PS 148

by El Cucu » Sun Feb 22, 2009 8:05 am

Hi Guys can someone explain why when the frequency distribution is simetric with regard to a number the mean is equal to the average ? many tks in advance!

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Source: Beat The GMAT — Problem Solving | Sun Feb 22, 2009 8:05 am

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