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Python script

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Dear Experts,

I am new to this forum and want your help to solve my problem.
I am using ArcGIS 10 and my problem states as:

I have a set of 46 monthly rainfall rasters
1. i want to extract the maximum and minimum pixel value from the the stack of 46 raster as MAX and MIN
2. Then using the equation shown in attached figure Attachment 25149 I have to calculate the cumulative probability of each x
3. where x is each individual raster (total 46)
4. I have already calculated the values of "a" also in the form of a raster and would like the program to pick these values from that respective raster.
5. The summation equation should run from n=1 to n=Max repeatedly

I would highly appreciate of a python expert who writes a few lines script for me to solve this
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