import numpy as np
arr = [[1, 17, 12, 12, 36],
[78, 16, 27, 70, 21],
[98, 45, 42, 11, 45, ]]
# mean along the columns
print("mean of our array along the columns by setting axis = 0 : ", np.mean(arr, axis = 0))
# mean along the rows
print("mean of our array along the rows by setting axis = 1 : ", np.mean(arr, axis = 1))