12 Standard normal table for proportion below#

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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
from scipy import stats

khanacademy

Standard normal table for proportion below fig 1

x = 161.4 
mu = 150
sigma = 20

z_score = (x - mu) / sigma

z_score

0.5700000000000003