Answer:
The stack is 3 1/2 inches thick.
Step-by-step explanation:
According to the line plot shown in the image attached, the thinnest book is 1/2 inches, and the thickest book is 1 1/4 inches.
We know that the stack is formed by 2 thinnest books and 2 thickest books. We need to just sum fractions to find the thick of the stack
[tex]Stack = \frac{1}{2}+\frac{1}{2}+1\frac{1}{4} +1\frac{1}{4}[/tex]
We need to transform from mixed number to fraction
[tex]Stack = 1 + \frac{5}{4} + \frac{5}{4} =1+\frac{10}{4}+\frac{4+10}{4}=\frac{14}{4}\\ Stack=3\frac{1}{2} \ in[/tex]
Therefore, the stack is 3 1/2 inches thick.
