statistics
posted by patina .
An average office worker uses 10000 sheets of paper each year. Assume that the population standard deviation is 3000 sheets per year.
Is it unusual for the office worker to use over 15000 sheets each year?
What % of workers use at least 8000 sheets per year?
Find P30. Interpret.
In a random sample of 100 office workers, find the probability that the mean number of sheets of paper used per year does not exceed 10500.

statistics 
PsyDAG
Z = (scoremean)/SD
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. For percent, multiply by 100.
What do you mean by "P30"?
Since the last question involves a distribution of means, use:
Z = (scoremean)/SEm
SEm = SD/√n
Use the same table.
Respond to this Question
Similar Questions

Statistics
Is this right? and how can I break it down if needed? 
Math for pharmacy Tech
My daughter Kim teaches and notes that the average student uses 75 sheets of paper every week. A) How many sheets will a student use in a 42week school year? 
Math
Which rate gives the best price for scrapbook paper? 
statistics
A widget factory's worker productivity is normally distributed. one worker produces an average of 75 widgets per day with a standard deviation of 20. another worker produces at an average rate of 65 per day with standard deviation … 
math
Eddie buys 100 sheets of heavyweight paper to make a notebook. He places 1/4 of the sheets in a section for English and 1/3 of the reamining sheets in a section for math. Which section is thicker if the 100 sheets of heavyweight paper … 
Math
The printer in Nate and Beth's office was out of paper. So, they put a ream of paper in the printer, 500 sheets. Nate then printed 72 sheets. Beth then added 30 sheets of paper to the printer. What was the net change in the number … 
math
A printer holds 500 sheets of paper. After printing it held 210 sheets. Which equation can be used to find how many sheets were printed? 
Math
Eric bought a package of loose leaf paper that contained 500 sheets. In the first week, he used 1/5 of the paper. During the next two weeks, Eric used 2/5 of the remaining paper. How many sheets of paper did Eric have available at … 
Statistics
The Information Systems Audit and Control Association surveyed office workers to learn about the anticipated usage of office computers for personal holiday shopping (USA Today, November 11, 2009). Assume that the number of hours a … 
statistics
The Information Systems Audit and Control Association surveyed office workers to learn about the anticipated usage of office computers for personal holiday shopping. Assume that the number of hours a worker spends doing holiday shopping …