Tied Ranks Equal or Repeated Rank
When two or more items have equal values it is difficult to give ranks to them. In that case the items are given the average of the ranks they would have received. If they are not tied. For example if two individuals are placed in the seventh place they are each given the rank 7+8/ 2 = 7.5 which is common rank to be assigned and the next will be 9 and it there equal at the seventh place they are given the rank 7+8+9/ 3 = 8 which is the common rank to be assigned to each, and the next rank will be10 in this case. A slightly different formula is used when there is more than one item having the same value. The formula is
R-1-6 ∑D2+ 1/12(m3-m) + 1/12(m3-M).......... / n3- n