import numpy as np
import seaborn as sns # seaborn package를 이용
import matplotlib.pyplot as plt # matplotlib.pyplot package를 이용
from numpy import random

# set the random seed:
np.random.seed(12345)

r=100000

z = random.normal(loc=0, scale=1, size=r)

np.mean(z)
print("Mean of Standard Normal Distribution is : ", np.mean(z))

np.var(z)
print("Variance of Standard Normal Distribution is : ", np.var(z))

sns.histplot(data=z, x=None, kde=True).set(title='Histogram of z)')
plt.show()