Q$2(8$ marks$)$

Three ECGs are given

Calculate each one's heart rate $($beats $/$ sec$)$ to determine its condition

$\backslash$table$[[$Condition$,$HR $($BPS$)],[$Atrial Fibrillation,$1\mathrm{.}43],[$Normal$,1\mathrm{.}67],[$Atrial Flutter,$2\mathrm{.}5]]$