Which states the following expression: (2 x 3) + (2 x 9) a) the product of two and three and nine b) the sum of two and three and two and nine c) the total of two times three and two times nine d) the product of two times three and two times nine

This is very simple. The answer is C. It's requiring you to multiply the numbers in the parentheses and then add them together.

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.