===== Exercise 3 =====

  - What is the difference between variance and standard deviation?
  - Write a Python command to calculate the mean of a list [3, 5, 7, 9].
  - How do you visualize a normal distribution in Python?
  - Write a Python script to compute and visualize the shear force distribution along a simply supported beam.
  - Write a Python script using SciPy to solve the differential equation dy/dt = -y + 10.