1. For every sale call made, the number of books sold increases by how much?

2. If a sales representative makes 55 sales calls, what will be the expected number of books sold by the publisher?

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-making made by their force. A sampling of the number of sales calls made and the number of books sold is shown in the following table. 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-making made by their force. A sampling of the number of sales calls made and the number of books sold is shown in the following table