Why below code to calculate variation in standard deviation is failing

Question

from math import sqrt

players = [180, 172, 178, 185, 190, 195, 192, 200, 210, 190]

sum = 0

for i in players:
sum = sum + i

avg = sum / len(players)

var_list = []

for i in players:
var_list.append((avg - i)**2)

varianc = 0

for i in var_list:
varianc = varianc + i

variance_val = varianc / len(players)

sd = sqrt(varianc)

count = 0
hm = avg + sd
lm = avg - sd

for i in players:
if (i >= lm) and (i <= hm):
count +=1

print(count)

Answer 1

sd = sqrt(variance_val)

Answer 2

And your expected output is?