Below are scores for a grouped frequency distribution.

C.I. f f

195 – 199 1

190 – 194 2

185 – 189 4

180 – 184 5

175 – 179 8

170 – 174 10

165 – 169 6

160 – 164 4

155 – 159 4

150 – 154 2

145 – 149 3

140 – 144 1

N = 50

Mean = 170.80

Calculate the average deviation for the data provide above