03 Probability with discrete random variable example

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import numpy as np
import pandas as pd
from pandas import Series, DataFrame
import matplotlib.pyplot as plt
import seaborn as sns

khanacademy

df = DataFrame({'X = # of packs': ['P(X)'], '1': [0.2]}).set_index('X = # of packs')

df

	1
X = # of packs
P(X)	0.2

df['2'] = (1 - df['1']) * 0.2

df

	1	2
X = # of packs
P(X)	0.2	0.16

df['3'] = (1 - (df['1'] + df['2'])) * 0.2

df

	1	2	3
X = # of packs
P(X)	0.2	0.16	0.128

df['4'] = (1 - (df['1'] + df['2'] + df['3']))

df

	1	2	3	4
X = # of packs
P(X)	0.2	0.16	0.128	0.512

df['Total'] = df.sum(axis=1)

df

	1	2	3	4	Total
X = # of packs
P(X)	0.2	0.16	0.128	0.512	1.0