Number of beats ($N$) = $33 \pm 1$ beats
Time ($T$) = $30.0 \pm 0.4$ s
Step 2: Calculate the heart rate in beats per second.
Heart rate ($R$) = $N/T$
$R = 33 / 30.0 = 1.1$ beats/s
Step 3: Convert the heart rate to beats per minute.
Since 1 minute = 60 seconds,
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