A bank branch estimates that the rate of arrival of customers (following a distribution Poisson) is 30 clients/hour. At the time of observation of the phenomenon a study there is only one window open to the public and the service time is distributed exponentially with an average of 115 sec/ client. Decide: a) Average number of clients in the system and average number of clients on hold. b) Average waiting time and average time spent at the branch.

A bank branch estimates that the rate of arrival of customers (following a distribution Poisson) is 30 clients/hour. At the time of observation of the phenomenon a study there is only one window open to the public and the service time is distributed exponentially with an average of 115 sec/ client. Decide: a) Average number of clients in the system and average number of clients on hold. b) Average waiting time and average time spent at the branch.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

We want to predict maintenance expense ( y) for a truck during the current year, from the independent variables x1 miles driven (in thousands) during the current year and x2age of the truck (in years) at the beginning of the current year. We are given the information in
How does the company deal with the difficulties inherent in attracting and retaining a diverse workforce? Build on the concept while still offering enough reasoning.
During the internship season m tech companies are looking to hire CS undergrads, each company has k number of available positions. There are also n CS undergrads, each interested in joining one of the companies. After all the interviews each company has rankings of students in order of preference, and each student has a ranking of companies in order of preference. We can assume that there are more internship slots available than the number of students. (This means that at the end not all slots will be filled.) Describe an algorithm that finds a stable assignment of students to companies. That is, each student will get assigned to one company and the resulting matching is stable. In your answer make sure to follow the guidelines of solving an algorithmic problem, as described above.
Stanford University researchers published an MIT working paper titled “The Economics of Ride Hailing: Driver Revenue, Expenses, and Taxes” (February 2020). One of the objectives of the study was to determine whether ride-share drivers at Uber and Lyft actually make a profit. Data collected from a sample of 1,121 ride-share drivers yielded a mean monthly profit �¯=$661 with standard deviation �=$583. An Uber executive reports that �, the true mean monthly profit of all its ride-share drivers, is $1,000. You want to test the executive’s figure using �=.10. Set up the null and alternative hypotheses for the test. Assume that you believe the true mean monthly profit is less than $1,000. Find the rejection region for the test. Compute the test statistic. Use statistical software to find the p-value for the test. What is your conclusion? Show that the conclusion is the same whether you use the rejection region or p-value.
The stand rental system is going to be used by any company to search for stands, either by prices, by prices, or by types. If there is any interest then the company will request a quotation through the system. This request will be assessed by a salesman of INSIGHTS. The salesman will issue a quotation accordingly. In the case the prices are convenient, the company will reserve the stands that it is interested in. The company has three days to pay the costs of the stands. The costs are obtained from the invoice generated by the salesman. The company can cancel its reservation any time. Furthermore, before the starting of the event, an employee of INSIGHTS with the role of supervisor will generate a report about the companies that paid the fees and the current setup of the exhibition. The supervisor will also issue the necessary reminders to the companies to bring their equipment as well as bring their promotion documents to the site of the exhibition. In order to implement the expected…
Credit Scoring
We estimate the following LRM for the relationship between COURSE_EVAL and AGE of the instructor: E(COURSE_EVAL | AGE) = 4.774 -0.2154 * log(AGE) where the AGE variable is transformed with the logarithmic function. Provide an interpretation of the coefficient estimate -0.2154.
3. The finish times for marathon runners during a race are normally distributed with a mean of 195 minutes and a variance of 289 minutes. What is the probability that a runner will complete the marathon within 180 minutes?
If 25% of all U.S. drivers are observed traveling at 50 mph or less, what is the mean µ?
GENERATE THE DECISION VARIABLE SOLUTION AND GENERATE AN ANSWER REPORT 2. During the winter WeeMow Lawn Service contracts with customers for cutting lawns starting in the spring. WeeMow provides service to residential and commercial customers. The service has identified 50 possible residential customers and 15 potential commercial customers it has contacted. WeeMow services a customer once every 2 weeks during the growing season. A residential lawn on average takes 1.2 hours to cut, and a commercial property requires 5 hours to cut; the service's available work time is 8 hours, 6 days per week. The profit for a residential lawn is $23, and the profit for a commercial property is $61. The service has established a weekly budget of $350 for management, gas, and other materials, plus equipment repair. A residential lawn averages $12 in management, gas, material, and repair costs, and a commercial property averages $20 in costs. WeeMow wants to know how many residential and commercial jobs…
In a small store customers arrive at the rate 10 per hour and they stay inaverage 30 minutes. What are the average number of customers in the store?(Use Little’s Law)
During the busy hour, a number of subscriber through a telephone exchange makes 7 calls and receives 5 calls and the average holding duration is approximately 3 minutes. Determine the traffic intensity in Erlang, CCS, CS and CM. O 0.6 E = 21.96 CCS = 2610 CS = 36 CM O 0.6 E = 21.6 CCS = 2160 CS = 36 CM O 0.6 E = 2.6 CCS = 2106 CS = 36 CM O None of these