Table $8\mathrm{.}3$

A textbook publisher for books used in business schools believes that the number of books sold is related to the number of campus visits to decision makers made by their sales force. A sampling of the number of sales calls made and the number of books sold is shown in the following table.

NUMBER OF SALES CALLS MADE NUMBER OF BOOKS SOLD

$25375$

$15250$

$25525$

$45825$

$35550$

$25575$

$25550$

$35575$

$25400$

$15400$

Use the information provided in Table $8\mathrm{.}3.$ What percent in the variation of the variable Books Sold is explained by the value of the variable Sales Calls Made?

$86\mathrm{.}5\%$

$74\mathrm{.}8\%$

$72\mathrm{.}5\%$

$83\mathrm{.}3\%$