Frequency Tables

[Atomic_Sheep]

for the two frequency ranges of say -2,0 and 0,2, what happens if you have a value that is 0. The book adamantly states that based on the cumulative absolute frequency we might have 250 observations that are negative, however, what if we have a few values that are 0 making the count say 248. How do we glean that information and not get caught out?