di is the deviation of xi from assumed mean a. If mean = x + ∑fidi /∑fi, then x is class size number of observation assumed mean none of these Share with your friends Share 3 Michael answered this mean= a + ∑fidi/ ∑fi where,a is assumed meandi=xi-a 4 View Full Answer Sanskriti Gupta answered this x is the class size -1 P.layasree answered this Lahari -2 Pavan answered this Jejwje 0