What is cumulative histogram ? How do you create it using PyPlot ?

What is frequency polygon ? How do you create it ?

What is Boxplot ? How do you create it in Pyplot ?

Execute the following codes and find out what happens ? (Libraries have been imported already ; plt is the alias name for matplotlib.pyplot)

A = np.arange(2, 20, 2)
B = np.log(A)
plt.plot(A, B)

Will this code produce error ? Why/Why not ?