comment in your $m$ file

$8.$ Plot the data from ECG$1.$mat

a$.$ HINT: Create a new variable, ecg$\_$signal, that only has the $2^{nd}$ column of the data from ECG$1.$mat which is the ecg signal in $mV.$ You want to make sure ecg$\_$signal is a single column. Lecture $1$ has help on how to do this.

$9.$ How many beats are in your signal? Note: each beat has a high peak of about $1mV$ which is called the $r-$wave and is the electrical activity from the left ventricle beating. Write this as a comment in your $m$ file

$10.$ Let's say this ECG signal is from a long distance running who has a resting heart rate of $50.$ beats per minute. How many minutes of data do you have? Write this as a comment in your $.$m file

$11.$ How many seconds of data do you have? Write this as a comment in your $m$ file