InverseChiSquared Command

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InverseChiSquared( <Degrees of Freedom>, <Probability> )
Computes the inverse of cumulative distribution function of Chi squared distribution at probability p, where the Chi squared distribution has given d degrees of freedom.
In other words, finds t such that P(X ≤ t) = p, where X is Chi squared random variable.
Probability p must be from [0,1].
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