algorithm - Create a mark function from a normal law -

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i'm working on android application , @ point, retrieve value contained between -100 , 100 follow normal law (i don't have parameters of law).

i create function returns me mark on 20 avoid have marks between 8 , 12, "stretch" values around 0.

for example, variation of 1 around 0 give me 0.5 point of difference in mark, , 1 point variation around 100 give me 0.01 point of difference in mark.

is there algorithm/function/trick gave me possibility ? conditions or requirement ? there library available give me possibility ? (i search didn't found...)

thank !


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