python - Why program is returning wrorng value

Question

code is returning me wrong value where negative valu is expected it is returning me positive please someone will help

import numpy as np
import pandas as pd
import matplotlib.pyplot as plt 
from sklearn.linear_model import LinearRegression




x = [2,5,8,4,6,1]
y = [1,6,3,6,4,2]

xbar = np. mean(x)
ybar = np.mean(y)
print(xbar,ybar)

# 4.333333333333333 3.6666666666666665

xminusxbar = x - xbar

print(xminusxbar)

# [-2.33333333  0.66666667  3.66666667 -0.33333333  1.66666667 -3.33333333]

plt.scatter(x,y,  color = "red")