Question

In: Statistics and Probability

In the library on a university campus, there is a sign in the elevator that indicates...

In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 persons. Furthermore, there is a weight limit of 2500 lb. Assume that the average weight of students, faculty, and staff on campus is 154 lb, that the standard deviation is 27 lb, and that the distribution of weights of individuals on campus is approximately normal. If a random sample of 16 persons from the campus is to be taken:

What is the expected value of the sample mean of their weights?
μx =  lb


(b) What is the standard deviation of the sampling distribution of the sample mean weight? (Round your answer to two decimal places.)
σx =  lb

(c) What average weights for a sample of 16 people will result in the total weight exceeding the weight limit of 2500 lb? (Round your answer to two decimal places.)
x >  lb

(d) What is the chance that a random sample of 16 persons on the elevator will exceed the weight limit? (Round your answer to four decimal places.)
P =

Solutions

Expert Solution

Solution :

Given that,

mean = = 154

standard deviation = = 27

a ) n = 16

= 154

b ) = / n

= 27 16

= 6.75

= 6.75

c ) 2500 / 16 = 156.25

d ) P ( >156.25 )

= 1 - P ( < 156.25 )

= 1 - P ( - / ) < ( 156.25 - 154 / 6.75)

= 1 - P ( z < 2.25 / 6.75 )

= 1 - P ( z < 0.33 )

Using z table

= 1 - 0.6293

= 0.3707

Probability = 0.3707


Related Solutions

1.) In the library on a university campus, there is a sign in the elevator that...
1.) In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 persons. In addition, there is a weight limit of 2,500 pounds. Assume that the average weight of students, faculty, and staff on campus is 155 pounds, that the standard deviation is 27 pounds, and that the distribution of weights of individuals on campus is approximately normal. Suppose a random sample of 16 persons from the campus will be selected....
Assume that a minus sign in the input indicates pop the stack and write the return...
Assume that a minus sign in the input indicates pop the stack and write the return value to standard output, and any other string indicates push the string onto the stack. Further, suppose that the following input is processed: it was - the best - of times - - it was - the - - 1/ What is written to the standard output? 2/What are the contents (top to bottom) left on the stack?
Task: Network planning A university has a main campus and a remote campus at another location....
Task: Network planning A university has a main campus and a remote campus at another location. The default router to the Internet on the main campus has an IP address of 10.0.0.1/24. The main campus network is connected to the Internet through a router called RouterA. The main campus has no more than 15000 staff and students. The remote campus network is connected to the main campus network through a router called RouterB. The remote campus has no more than...
You have been appointed as an H&S in charge of a university campus. The campus includes...
You have been appointed as an H&S in charge of a university campus. The campus includes schools of science and technology that has chemicals and mechanical engineering laboratories. The president informed you that there have been a few incidents in past that included fire in the chemical laboratory in which a few students got burns, a fire in the canteen and an incident in civil engineering lab in which a lab technician almost lost one of his hands while handling...
At a large university it is known that 45% of the students live on campus. The...
At a large university it is known that 45% of the students live on campus. The director of student life is going to take a random sample of 100 students. What is the probability that more than half of the sampled students live on campus?
Using the resources at your campus or public library (or on the Internet), select 5 mutual...
Using the resources at your campus or public library (or on the Internet), select 5 mutual funds—a growth fund, an equity-income fund, an international (stock) fund, an index fund, and a high-yield corporate bond fund—that you think would make good investments. Briefly explain why you selected these funds. List the funds’ holding period returns for the past year and their annual compound rates of return for the past 3 years. (Use a schedule like the one in Table 12.2 to...
Chapter Case: Campus Bikes Campus Bikes is a popular bicycle shop located near a major university....
Chapter Case: Campus Bikes Campus Bikes is a popular bicycle shop located near a major university. The business has grown and the owner, Mark Turner, wants to install an up-to-date computer system to handle all business functions. Background Campus Bikes sells several brands of new bikes, including everything from high-end racing models to beach cruisers. In addition to sales of new bikes and accessories, Mark’s service department is always busy. The staff includes Mark himself, a bookkeeper, two part-time sales...
Part I On a certain university campus there is an infestation of Norway rats. It is...
Part I On a certain university campus there is an infestation of Norway rats. It is estimated that the number of rats on campus will follow a logistic model of the form P(t)=50001+Be−ktP(t)=50001+Be−kt. A) It is estimated that there were 500 rats on campus on January 1, 2010 and 750 on April 1, 2010. Using this information, find an explicit formula for P(t)P(t) where tt is years since January 1, 2010. (Assume April 1, 2010 is t=.25t=.25.) P(t)= P(t)=  . B)...
Case Study - Performance Management at the Yanbu University College Library The Yanbu University College, Yanbu,...
Case Study - Performance Management at the Yanbu University College Library The Yanbu University College, Yanbu, was established in 2005. As in the case of many other modern university libraries worldwide that face resources challenges and the need to serve an increasingly diverse customer base, the YUC Library has implemented numerous initiatives. One such initiative is a performance management system. However, several of the components of the performance management process at the YUC library are in need of improvement. First,...
The Garvey Sign Company uses the allowance method in accounting for uncollectible accounts. Past experience indicates...
The Garvey Sign Company uses the allowance method in accounting for uncollectible accounts. Past experience indicates that 6% of accounts receivable will eventually be uncollectible. Selected account balances at December 31, 2019, and December 31, 2020, appear below: 12/31/2019 12/31/2020 Net Credit Sales $425,000 $500,000 Accounts Receivable 80,000 100,000 Allowance for Doubtful Accounts 4,000 ? Instructions: (a) Record the following events in 2020. Omit explanations. 8pts Aug. 10 - Determined that the account of Kurt West for $900 is uncollectible....
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT