Posted by ty on Saturday, February 18, 2012 at 6:52pm.
store manager is doing a study on how to staff his franchise. He knows that the average number of pizzas ordered is 12 per hour with a standard deviation of 1.4 pizzas. Staffed with 3 employees, he can assemble up to 15 pizzas per hour. If his store is open for 10 hours each day, what is the probability that he will receive more orders than he can assemble in a given hour?

business statistics  PsyDAG, Sunday, February 19, 2012 at 11:01am
Z = (mean1  mean2)/standard error (SE) of difference between means
SEdiff = √(SEmean1^2 + SEmean2^2)
SEm = SD/√n(hours)
If only one SD is provided, you can use just that to determine SEdiff.
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion related to the Z score.