Question 1053916
Ned to KNow:
{{{z =blue (x - mu)/blue(sigma)}}}
0r
{{{blue(sigma)*z + mu=blue (x)}}}
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z-score of 2.25 with a mean of 500 and a standard deviation of 75
{{{blue(75)2.25+ 500 =blue (x)}}}
Always list x as next highest value 
(As appropriate to instructions for number of decimal points to be used)
In this case believe next highest Integer Value would be appropriate.