Standard Deviation

how_many = input("How many numbers?")
how_many = int(how_many)
numbers = []
total = 0
sdtotal = 0

for number_count in range(how_many):
  number = input("Enter number " + str(number_count + 1) + ">")
  numbers.append(number)
  #
for number_count in range(how_many):
  number = int(numbers[number_count])
  total = total + number
mean = total/how_many
print("The mean value is " + str(mean) + ".")

for number_count in range(how_many):
  number = int(numbers[number_count])
  variance = number - mean
  number = variance * variance
  sdtotal = sdtotal + number

popsd = sdtotal / how_many
samplesd = sdtotal / (how_many - 1)

import math
popsd = math.sqrt(popsd)
samplesd = math.sqrt(samplesd)

print ("The population standard deviation is " + str(popsd) + ".")
print("The sample standard deviation is " + str(samplesd) + ".")