As discussed in the class, please respond to the following questions:

1. What is a signal?
2. In MATLAB, plot an ECG signal. You can use the ECG simulation for assistance.
3. Add power line noise with a frequency of 50 Hz to the signal.
4. Discuss the characteristics of the signal.

Please submit your answers in a PDF format according to the guidelines we previously discussed, and make sure to send it before the deadline.