Python for Data Science _ Basketball Player

Question

Hello
Could you help me to fix my code?
I don't understand with part has a problem

import math as mt

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

mean = sum(players) / len (players)
var = 0
i = 0
for i in players:
var += (i - mean)**2
stdvar = mt.sqrt(mean / len(players))

cnt = 0
low , high = mean - stdvar, mean + stdvar
for x in players:
if low < x < high:
cnt += 1
print (cnt)