What is the median of the following data set? {5, 2, 9, 7, 4}

a: 5

b: 7

c: 8

d: 9

A:5 
First you put the numbers in numerical order. whenever there is an odd amount of numbers, the median is the middle number

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.