import numpy as np
import pandas as pd
ch2_1 = np.genfromtxt("http://kanggc.iptime.org/book/data/ch2_1.txt")
ch2_1
print("Data of ch2_1 is : ",f'\n{ch2_1}\n')

ch2_1_p = pd.Series(ch2_1.flatten())
ch2_1_p
print("Data of ch2_1_p is : ",f'\n{ch2_1_p}\n')

import statistics   # statistics package를 이용
m_ch2_1 = statistics.mean(ch2_1_p) 
me_ch2_1 = statistics.median(ch2_1_p)
mo_ch2_1 = statistics.mode(ch2_1_p)
var_ch2_1 = statistics.variance(ch2_1_p)
sd_ch2_1 = statistics.stdev(ch2_1_p)
ch2_1_p.describe()

print("Mean of ch2_1 is :", m_ch2_1)
print("Median of ch2_1 is :", me_ch2_1)
print("Mode of ch2_1 is :", mo_ch2_1)
print("Variance of ch2_1 is : ", var_ch2_1)
print("Standard Deviation of ch2_1 is : ", sd_ch2_1)
print("Summary Statistics of ch2_1_p is : ", f'\n{ch2_1_p.describe()}\n')

import seaborn as sns # seaborn package를 이용
sns.histplot(ch2_1_p, fill=False).set(title='Histogram of ch2_1_p')