RiskNormalAlt, RiskNormalAltD
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                                                     Description 
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                                                     RiskNormalAlt(arg1type, arg1value, arg2type,arg2value) specifies a normal distribution with two arguments of the type arg1type and arg2type. These arguments can be either “mu”, “sigma”, or a value between 0 and 1 to specify a percentile. 
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                                                     Examples 
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                                                     RiskNormalAlt(5%,1,95%,10) returns a normal distribution with 5th percentile 1 and 95th percentile 10. 
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                                                     Guidelines  | 
                                                
                                                     With RiskNormalAltD, any entered percentile values are cumulative descending percentiles, where the percentile specifies the probability of a value greater than or equal to the entered value.  |