>>> from marks import mark_distribution

>>> l = [['44444444D',8.3],['88888888H',4.1],['22222222B',4.8],['66666666F',5.3],['99999999J',10.0]]
>>> dn = mark_distribution(l)
>>> dn
[0, 0, 0, 0, 2, 1, 0, 0, 1, 0, 1]
>>> l = [['3A', 5]]
>>> dn = mark_distribution(l)
>>> dn
[0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0]
>>> l = [['1A', 2], ['2B', 1], ['3C', 4]]
>>> dn = mark_distribution(l)
>>> dn
[0, 1, 1, 0, 1, 0, 0, 0, 0, 0, 0]