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Function to calculate the cumulative probability corresponding to a given a z value from a normal distribution.
pval()
The cumulative probability from the left tail of the distribution till the given z value.
The user input is as follows: z value: A number that can be from - infinity to + infinity. E.g. -1.65
John C. Hull, "Options, Futures, and Other Derivatives", 8/E, Prentice Hall, 2012.
zval