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Query: John's pulse rate is taken every 6 hours over a three day period. The graph shows his pulse rate in beats per minute. [Please click on the graph to see it full size]
Find the difference between his lowest and highest pulse rate on the 3rd of May.
Response: From the graph the highest rate is 102 and the lowest is 97. Hence the difference is 102-97=5 beats per minute.
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