Then select the letter that best represents the location of the number on the number line 8−−√ 8−−√

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.

I’m not sure about that

The answer is 10. sorry i was wrong the 1st time