Python - numpy - mean

import numpy as np

data = np.array([ [40,60,3,3], [60,80,8,11], [80,100,30,41] ])


for row in data:
    d = row[0:2]
    average = d.mean()
    print(average)

# or

print(data[:,0:2].mean(axis=1))

'''
50.0
70.0
90.0
[ 50.  70.  90.]
'''