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#!/usr/bin/python
import sys
import math
vals=[]
sum=0
cnt=0
for line in sys.stdin:
num=float(line)
vals.append(num)
sum=sum+num
cnt=cnt+1
avg=sum/cnt
stddev=0
for val in vals:
stddev=stddev+ (val-avg)**2
stddev=stddev/cnt
stddev=math.sqrt(stddev)
print "avg is " , avg
print "stddev is " , stddev
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