El Cucu Master | Next Rank: 500 Posts View User Profile 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! Top Quote