>>> from tests import posa_pesos

---- inici

>>> preg1 = [True, False, True, False, False]
>>> pesos1 = posa_pesos(preg1)
>>> pesos1 == [1/2, -1/3, 1/2, -1/3, -1/3]
True

Arrodoneix a dos decimals els elements de la llista que retorna posa_pesos

>>> [round(p, 2) for p in pesos1]
[0.5, -0.33, 0.5, -0.33, -0.33]

---- fi

>>> preg = [False, True, False, False, False]
>>> pesos = posa_pesos(preg)
>>> [round(p, 2) for p in pesos]
[-0.25, 1.0, -0.25, -0.25, -0.25]

>>> preg = [False, False, True, False, False, True, False]
>>> pesos = posa_pesos(preg)
>>> [round(p, 2) for p in pesos]
[-0.2, -0.2, 0.5, -0.2, -0.2, 0.5, -0.2]

>>> preg = [False, True, False, True, False, True, False, True, False]
>>> pesos = posa_pesos(preg)
>>> [round(p, 2) for p in pesos]
[-0.2, 0.25, -0.2, 0.25, -0.2, 0.25, -0.2, 0.25, -0.2]

>>> preg = [True, False, True, True, True]
>>> pesos = posa_pesos(preg)
>>> [round(p, 2) for p in pesos]
[0.25, -1.0, 0.25, 0.25, 0.25]