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Interpreting graphs of functions

A doctor observes a graph that shows the electrical activity (in volts) of the heart of a patient over a period of time (in seconds). Each local maximum of 0.0040.004 volts corresponds to one heartbeat. The doctor needs to calculate the heart rate of the patient in beats per minute. What is the heart rate of this patient?
beats per minute
This chart presents a graph in the 't' 'V' plane. The horizontal 't' axis is in seconds and has tick marks from 0 to 6 in increments of 1. The vertical 'V' axis has tick marks from 0 to 0.007 in increments of 0.001. The graph shows an erratic curve that starts at the point 0.004, then declines rapidly below the 't' axis and has many little peaks and valleys above and below the 't' axis before increasing sharply again to a 'V' value of 0.004 around 't' equals 0.75. It repeats the same pattern in both directions over the entire length of the 't' axis.