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#!/usr/bin/python
# calculate statistics for a set of numbers from stdin
import sys
from math import sqrt
def mean(data):
return sum(data) / len(data)
def variance(data):
n = len(data)
ss = sum(x**2 for x in data) - (sum(data)**2 / n)
return ss / (n - 1)
def sdev(data):
return sqrt(variance(data))
xs = []
for line in sys.stdin:
xs.append(float(line))
print("Data:", xs)
print("n=", len(xs))
print("min:", min(xs))
print("max:", max(xs))
print("Mean:", mean(xs))
print("sd:", sdev(xs))
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