In frequency analysis in hydrology, the streamflow QT corresponding to a specified exceedance probability p (or return period T = 1/p) can be computed as
QT = mu + KT sigma
where μ and σ are the mean and standard deviation of the streamflow series, respectively, and KT is the frequency factor.
Write a function to compute the frequency factor for the normal distribution given the exceedance probability as a vector.
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Tim William Dyuman Joshi Connor Wilford

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