Quiz.py

import math
AbnormalECG = open('AbnormalECG.txt').read().split()
ReferenceECG = open('ReferenceECG.txt').read().split()

sum = 0

for i in range(len(AbnormalECG)):
    sum = sum + float(AbnormalECG[i]) * float(ReferenceECG[i])

ex = 0
for i in range(len(AbnormalECG)):
    ex = ex + float(AbnormalECG[i]) * float(AbnormalECG[i])

ey = 0
for i in range(len(ReferenceECG)):
    ey = ey + float(ReferenceECG[i]) * float(ReferenceECG[i])


final =  1 / (math.sqrt(ey) * math.sqrt(ex) ) * sum

print(final)