# Statistics

posted by .

A market research company employs a large number of typists to enter data into a computer database. The time taken for new typists to learn the computer system is known to have a Normal distribution with a mean of 2.167 hours and a standard deviation 20 minutes. A candidate is automatically hired if he or she learns the computer system in less than 100 minutes. A cut off time is set at the slowest 40% of the learning distributions. Anyone slower than this cut-off time is not hired
A. 0.023
B. 0.067
C. 0.159
D. 0.309

This is what I did. I first converted 2.167 hours to minutes.
2.167 hours= 130.02 minutes
Then entered the data in my calculator
normalcdf (-e99, 100, 130.02, 20)
=.0666
or .067.
Thus the answer is B. Tell me if I'm right and if I'm wrong can you help me figure out what I did wrong and how to approach the right answer. Thank you :)

## Similar Questions

You are a technical writer in a large company, working on a training manual to help new users learn the company's computer system. Employees will use your manual in training seminars taught by your company's trainers. the manual will …
2. ### RESEARCH AND EVALUATION II

A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 first time users of a new statistics program revealed the mean time to learn it was 39 hours with …
3. ### Statistics

A recent article in a computer magazine suggested that the mean time to fully learn a new software program is 40 hours. A sample of 100 first-time users of a new statistics program revealed the mean time to learn it was 39 hours with …

You are a technical writer in a large company who is working on a training manual to help new users learn the company's computer system. Employees will use your manual in training seminars taught by your company's trainers. The manual …
5. ### finance

Your company will generate \$45,000 in cash flow each year for the next nine years from a new information database. The computer system needed to set up the database costs \$260,000. Assume you can borrow the money to buy the computer …

A data processing analyst for a research company finds that a preliminary computer run of survey results that his company conducted for a client show that consumers love the client's new product. Based on that information, the analyst …
7. ### maths

Three typists working 8 hours a day type a document in 10 days. If only 2 typists are working, how many hours a day should they work to finish the job in 12 days.
8. ### Statistics

1. The average time it takes for a cellphone to reboot is 3 minutes with a standard deviation of 10 seconds. The average time it takes a computer to restart is 5 minutes with a standard deviation of 15 seconds. Both are normally distributed. …
9. ### 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 …
10. ### 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 …

More Similar Questions