from __future__ import print_function

# 均值計算
data = [3.53, 3.47, 3.51, 3.72, 3.43]
average = float(sum(data))/len(data)
print(average)


#方差計算
total = 0
for value in data:
    total += (value - average) ** 2

stddev = math.sqrt(total/len(data))
print(stddev)


# 中位數計算
data.sort()
mid = len(data) / 2
if len(data) % 2 == 0:
    median = (data[mid - 1] + data[mid]) / 2.0
else:
    median = data[mid]

print(median)