Y=−
/2x+5/
+
/2x−5/

if x<−2.5;
if x>2.5;
if −2.5≤x≤2.5

The major difference is that a histogram is only used to plot the frequency of score occurrences in a continuous data set that has been divided into classes, called bins.  bar charts, on the other hand, can be used for a great deal of other types ofvariables  including  ordinal  andnominal  data sets.

40%=2/550=1/230=3/1056=14/25