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# Standard Deviation

a guest Oct 19th, 2018 109 Never
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1. how_many = input("How many numbers?")
2. how_many = int(how_many)
3. numbers = []
4. total = 0
5. sdtotal = 0
6.
7. for number_count in range(how_many):
8.   number = input("Enter number " + str(number_count + 1) + ">")
9.   numbers.append(number)
10.   #
11. for number_count in range(how_many):
12.   number = int(numbers[number_count])
13.   total = total + number
14. mean = total/how_many
15. print("The mean value is " + str(mean) + ".")
16.
17. for number_count in range(how_many):
18.   number = int(numbers[number_count])
19.   variance = number - mean
20.   number = variance * variance
21.   sdtotal = sdtotal + number
22.
23. popsd = sdtotal / how_many
24. samplesd = sdtotal / (how_many - 1)
25.
26. import math
27. popsd = math.sqrt(popsd)
28. samplesd = math.sqrt(samplesd)
29.
30. print ("The population standard deviation is " + str(popsd) + ".")
31. print("The sample standard deviation is " + str(samplesd) + ".")
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