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))