The blood pressures, p mmHg, and the ages, t years, of 7 hospital patients are shown in the table below.
| Patient | A | B | C | D | E | F | G |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| t | 42 | 74 | 48 | 35 | 56 | 26 | 60 |
| p | 98 | 130 | 120 | 88 | 182 | 80 | 135 |
[?t = 341, ?p = 833, ?t² = 18181, ?p² = 106397, ?tp = 42948]
(a) Find p?, t? for these data.