In a study of exercise, a large group of male runners walk on a treadmill for 8 minutes. After this exercise, their heart rates vary with mean 8.5 beats per five seconds and standard deviation 1.1 beats per five seconds. This distribution takes only whole-number values, so it is certainly not Normal.
Let be the mean number of beats per five seconds after measuring heart rate for 12 five-second intervals.
What is the standard deviation (0.0001) of distribution of
according to the central limit theorem? [removed] beats per five seconds
What is the probability (0.0001) that
is less than 8? [removed]
What is the probability (0.0001) that the heart rate of a runner is less than 105 beats per minute? [removed]
(Hint: restate this problem in terms of per five seconds).
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