calculate the inverse of the value of qnorm

The inverse function of qnorm is pnorm:

> pnorm(qnorm(0.2))
[1] 0.2
> qnorm(pnorm(4.2))
[1] 4.2

This holds for every probability distribution, because the quantiles (R functions with prefix q) are defined as the inverse function of the cumulative distribution function (R functions with prefix p).

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