Question 1
The mean rate is calculated by
◦ counting the number of P waves on a six-second strip and multiplying by 10.
◦ counting the number of QRS complexes on a six-second strip and multiplying by 10.
◦ counting the number of P waves in a minute-long rhythm strip.
◦ counting the number of QRS complexes in a minute-long rhythm strip.
Question 2

The heart rate in Figure 1 is closest to
◦ 100.
◦ 50.
◦ 70.
◦ 150.