How do you write 21% as a decimal

0.21

EXPLANATION:
You move the decimal place to the left twice when converting from a percentage to a decimal.

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.