Calculate the mean deviation about the mean for the following frequency distribution :
Class Interval :0−44−88−1212−1616−20Frequency :46852
ClassfMidpointfixi|xi−9.2|fi|xi−9.2|0−44287.228.84−866363.219.28−12810800.86.412−16514704.824.016−20218368.817.6N=25Total = 230Total = 96.0
Mean =23025=9.2
M.D.=9625=3.84