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Given the following information, determine the heart rate as precisely as the rules allow.
Heart rhythm is irregular
There are 6 R-waves in 6-inch tracing
There are 6.7 R-R intervals in 6-inch tracing
Heart rate is: ( 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70 ) bpm