Final answer:
The shape of the distribution of heart rates in the Normal probability plot of 200 male runners after 6 minutes of exercise on a treadmill is normal.
Step-by-step explanation:
The shape of the distribution of heart rates in the Normal probability plot can be determined by looking at its symmetry. If the distribution is symmetrical and bell-shaped, it is considered to be a normal distribution. In this case, the heart rates of 200 male runners after 6 minutes of exercise on a treadmill would most likely follow a normal distribution, so the shape would be normal.