A person (he/she) measures heart rate by counting the number of beats in 30 sec. -If 45 ± 2 beats are counted (in exactly 30sec), find  the percent uncertainty in the measurement of heartbeats per minute?  *If 45 ± 2 beats are counted in 30.0 ± 0.5 sec, what is the minimum of the range of values one expects for the heart rate in beats per minute?   *If 45 ± 2 beats are counted in 30.0 ± 0.5 sec, what is maximum heart rate in beats per minute?

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