Question

Sally bought five books.Their mean price was 3.25. The total cost for four books was 11.75.what was the cost of the fifth book​

Answer 1

$4.50

Explanation:

Use the mean formula: mean = sum of elements / number of elements

Let x represent the cost of the fifth book, and solve for x:

mean = sum of elements / number of elements

3.25 = (11.75 + x) / 5

16.25 = 11.75 + x

4.5 = x

So, the cost of the fifth book was $4.50