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Python mean and standard deviation of list

import numpy as np

# list containing numbers only
l = [1.8, 2, 1.2, 1.5, 1.6, 2.1, 2.8]

# switch to numpy array
v = np.array(l)

mean = v.mean() # average ~ 1.86
std = v.std() # stadrad deviation (square root of variance) ~ 0.48

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