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business statistics * Suppose, after you complete Bana 3000, you start a consulting firm. After 30...

business statistics

* Suppose, after you complete Bana 3000, you start a consulting firm. After 30 months, you have average monthly revenue of $200,000 with standard deviation of this raw data of $33,000. How much revenue would you at least expect to earn 80% of the time? Hint: Solve for x. Please graph this problem.

How can I get Z in this problem?
and graph please ?
the formula as our instructor said,
z= x-mean / standard deviation

z = × - 200000 / 33000

and I don't know how to continue here?!

math   Statistics-And-Probability   
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