$$P =\frac{\lambda^{k}e^{-\lambda}}{k!} $$



In [2]:

    
import numpy as np
l = 8









    



---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-2-285e8b814d12> in <module>()
----> 1 import numpy as np
      2 l = 8

ImportError: No module named numpy