Here is an equivalent of Excel's NORMSDIST function  (wrote for SYbase 12.5):

IF EXISTS (SELECT * FROM sysobjects WHERE type = 'P' AND name = 'GET_NORMSDIST')

    BEGIN

        PRINT 'Dropping Procedure GET_NORMSDIST'

       ...

Thank you for NORMSINV function ! It's work !!

Here is a SQL code for SYBASE 12.5 version:

IF EXISTS

(SELECT * FROM sysobjects...