8.29 Measuring pulse rate. You want to measure your resting pulse rate. You might count the number of beats in five seconds and multiply by 12 to get beats per minute.
(a) Consider counting the number of beats in 15 seconds and multiplying by 4 to get beats per minute. In what way will this improve the reliability of your measurement?
(b) Why are the first two measurement methods less reliable than actually measuring the number of beats in a minute?