1. The problem asks for the slowest pulse rate in the "after exercise" group. 2. The data is presented as a stem-and-leaf plot. For the "after exercise" group, the stems are the tens digits and the leaves are the ones digits to the right. 3. To find the slowest pulse rate, we look for the smallest number in the "after exercise" group. 4. The smallest stem in the "after exercise" group is 5, with leaves 0, 1, 1, 2, 3, 4, 5, 5, 6, 8. 5. The smallest leaf for stem 5 is 0, so the slowest pulse rate is $5 \times 10 + 0 = 50$. 6. Therefore, the slowest pulse rate after exercise is **50**.