<prompt> Normal QRS axis30 to 110deg-30 to 110deg110deg to 150deg- 110deg to - 150deg  <response>: Ans. b -30 to 110degRef: Ganong, 25th edp.524Normally, the QRS axis ranges from -30deg to 100degAxis more negative than -30deg is called left axis deviationAxis more positive than 100deg is called right axis deviation 