All of the following are electrolytes EXCEPT

What variance in RR intervals must be present to be considered sinus arrhythmia?

A. more than 20% B. more than 10% C. more than 40% D. more than 30%

Record the quotient of 75/100 to two decimal places.

A. 0.25 B. 0.65 C. 0.75 D. 0.85