Chapter 1.1, Problem 11HP

To determine

Explain how could Sheri justify her answer.

Explanation of Solution

GIVEN:

Sheri bought 6 items at the grocery store, the total cost of th items before tax was $12.35.

In order to explain how could sheri justify her answer, first using the average cost formula that is $\text{average cost }=\frac{\text{total cost}}{\text{number of items}}$ , as shown below:

  $\begin{array}{l}\text{average cost }=\frac{\text{total cost}}{\text{number of items}}\\ \text{average cost}=\frac{\$12.35}{6}\\ \text{average cost }\approx \text{2}\text{.058}\end{array}$

Here, the average is greater than 2,

So, it is obvious that at least one of the cost of item must be greater than 2.