Find the mean deviation about the mean for the given data.
xi 5 10 15 20 25 fi 7 4 6 3 5
xi fi fixi |xi−14| fi|xi−14| 5 7 35 9 63 10 4 40 4 16 15 6 90 1 6 20 3 60 6 18 25 5 125 11 55 25 350 158
Mean (¯¯¯x)=1N∑ fixi=125×350=14Mean deviation about mean=1N∑ni−1fi |xi−¯¯¯x|=125×158=6.32