[Haskell-cafe] Change value of a variable

[ptrash]

What i am exactly to do is this:

I have a list of pupils (type Pupil = (Name, Grade)) where I store the name
of the pupil and which grade he has. No I want to get the number (and
average number) of each grade. Something like 10 Pupils have a A (23%), 2
Pupils have a B ( 4 %) etc
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