Runners’ heart rates The figure below is a Normal probability plot of the heart rates of 200 male runners after six minutes of exercise on a treadmill.13 The distribution is close to Normal. How can you see this? Describe the nature of the small deviations from Normality that are visible in the plot.

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Expected z-score 3 2 0 -2 -3 70 80 90 100 110 120 130 140 150 Heart rate (beats per minute)