To determine if Marcella's statement is correct, we can set up a proportion.
Let x be the total number of books Marcella read. If 60 of the books were mysteries, then the proportion can be set up as:
60 (mysteries) = 0.06 (fraction of total books) * x
Solving for x, we get:
x = 60 / 0.06
x = 1000
Thus, Marcella read a total of 1000 books. Therefore, the mysteries do not equal 0.06 of the total books, as 60 mysteries out of 1000 books is 0.06, not 100 books.
To assist in visualizing this proportion, a model could be created using a bar graph. Marcella could draw a bar graph showing the total number of books she read (1000), with one bar representing the 60 mystery books. This visual representation would clearly show that the mysteries make up 0.06 of the total books, not 100 books.