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R.R. Jha, Tutor
Category: Homework
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Experience:  B.Tech
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# 1. New Jersey Power Co. provides lower rates to customers that

### Resolved Question:

1. New Jersey Power Co. provides lower rates to customers that agree to use energy savings mainly at off-peak hrs. 30% of its customers take advantage of these savings. The consumer affairs department has conducted a focus group and is preparing to conduct a random telephone survey of 500 customers. The department supervisor wants to make sure that the group will contain a sufficient proportion of off-peak users.
A. What is the probability of obtaining fewer than 150 off-peak users in the survey?
B. What is the smallest number of off-peak users likely to be included in this sample?
2. The characteristics of an industrial filling process in which an expensive liquid is injected into a container was investigated by Journal of Quality Technology. The quantity injected per container is approximate normally distributed with a mean of 10 units and a standard deviation of .2 units. Each unit of fill costs \$20 per unit. If a container contains less than 10 units is considered under-filled and must be reprocessed at a cost of \$10. A properly filled container sells for \$230
A. Find the probability that a container is under-filled? Not under-filled?
B. A container is initially under-filled and must be reprocessed. Upon refilling it contains 10.6 units. How much profit will the company make on this container?
C. The operations manager adjusts the mean of the filling process upward to 10.10 units in order to make the probability of under-filling approximately zero. Under these conditions what is the expected profit per container?
3. Assume that X us a binomial random variable with n=100 and p=.40. Use a mormal approximation to find the following
A. X is less than or equal to 35
B. X is greater than or equal to 40 but less than or equal to 50
C. X is greater than or equal to 38
5. The Chronicle of Higher Education Almanac reports that the percentage of undergraduate in the United States receiving federal financial aid is 45% at public four-year institutions and 52% at private four-year institutions. The U.S. Department of Education is interested in questioning a random sample of 100 U.S. undergraduate students to assess its satisfaction with federal financial aid procedures and polices.
A. Assume the appropriate percentage above applies to your institution. If a random sample of 100 students from your institution were contacted, what is the probability that 50 or more receive financial aid? Less than 25?
5. The distribution of the demand (in number of units per unit time) for a product can often be approximated by a normal probability distribution. For example: A baker has determined that the number of loaves of it’s white bread demanded daily has a normal distribution with a mean of 7,200 loaves and standard deviation of 300 loaves. Based on cost consideration, the company has decided that its best strategy is to produce a sufficient number of loaves so that it will fully supply demand on 94% of all days.
A. How many loaves of bread should the company produce?
B. Based on the production in part A., on what percentage of days will the company be left with more than 500 loaves of unsold bread?
Submitted: 3 years ago.
Category: Homework
Expert:  R.R. Jha replied 3 years ago.
Hi,
Welcome!

I'd be glad to help with these questions. I'll work these over and get back to you by tonight.

Thanks
Customer: replied 3 years ago.

I have class at 5:00 Pm eastern time and my homework is due, is there any way I can get ananswer by then? I need them for class. They do not have to be extensive answers

Expert:  R.R. Jha replied 3 years ago.
Alright, I'll send them before 5pm.
Customer: replied 3 years ago.

Thank you

Expert:  R.R. Jha replied 3 years ago.
You're welcome!
Customer: replied 3 years ago.

Expert:  R.R. Jha replied 3 years ago.
Sure!

Thanks
Customer: replied 3 years ago.
Any information? Please let me know
Expert:  R.R. Jha replied 3 years ago.
Working on them, would get back to you soon.
Customer: replied 3 years ago.
I need them as soon as possible, needed by 5:00
Expert:  R.R. Jha replied 3 years ago.
These are what I could complete by now

https://www.box.com/s/13uk6up44fsyytfirqit

Let me know if you need any further help.

Thanks
R.R. Jha, Tutor
Category: Homework
Satisfied Customers: 5471
Experience: B.Tech
Customer: replied 3 years ago.
Did you finish the rest?
Expert:  R.R. Jha replied 3 years ago.
Hi,

For Q5, please let me know whether I should percentage for public institution or private institution - whichever is the type of your college.

Thanks
Customer: replied 3 years ago.
Public
Expert:  R.R. Jha replied 3 years ago.

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