Gregs hot dogs

Question

The daily sales by Greg's Hot Dogs have a mean of $572.50 and a standard deviation of 26.10.
A. What percent of the time will have daily sales greater than 564
B. What percent of the time will the daily sales be greater then 600

Answer 1

Obtain a z-score chart

http://www.stat.ufl.edu/~athienit/Tables/Ztable.pdf

 

z = (X - μ) / σ

z = (564 - 572.50) / 26.10

 

Can you calculate z and answer?