(10%) (3) Assume you have noted the following prices for books and the number of pages that each book contains.

| Book | Pages (x) | Price (y) |
| --- | --- | --- |
| A | 500 | $7.00 |
| B | 700 | 7.50 |
| C | 750 | 9.00 |
| D | 590 | 6.50 |
| E | 540 | 7.50 |
| F | 650 | 7.00 |
| G | 480 | 4.50 |
| Sample mean | 601.43 | 7.00 |
| Sample standard deviation | 102.54 | 1.35 |
| Sample variance | 10514.29 | 1.83 |
| Sample covariance (x, y) | 104.17 | |

a. Develop a least-squares estimated regression line.