Problem 57620. Compute frequency factors for the normal distribution

ChrisR

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In frequency analysis in hydrology, the streamflow  corresponding to a specified exceedance probability p (or return period ) can be computed as
where μ and σ are the mean and standard deviation of the streamflow series, respectively, and  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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