2. During the summer months, a rental agency keeps track of the number of speedboats rented each day during a period of 90 days. The variable X represents the number of speedboats rented per day. The results are shown as follow. Number of days 45 30 15 Compute probability P(X) for each X 1.

2. During the summer months, a rental agency keeps track of the number of speedboats rented each day during a period of 90 days. The variable X represents the number of speedboats rented per day. The results are shown as follow. Number of days 45 30 15 Compute probability P(X) for each X 1.

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

There are three financial aid counselors. If a student’s last initial is from A – H, let them know that their counselor is Jon Stewart. If a student’s last initial is from I – Q, let them know that their counselor is Chelsea Handler. If a student’s last initial is from R – Z, let them know that their counselor is Brian Williams.Ask student for the FICO score, if it’s less than 660 tell that this student cannot have a loan.
A box contains three fair coins, and two trick coins that have heads on both sides.(a) What is the probability that a randomly selected coin from the box will come up heads whenflipped? (b) Suppose you randomly pick a coin from the box and flip it, and it comes up heads. What is theprobability that it’s one of the trick coins? (c) Let X be the random variable that represents the number of heads when every coin in the box isflipped. What is the probability distribution of X? (Hint: you can try counting all the outcomes,or you can remember that coin flips are independent of each other.) (d) What is the expected number of heads when all the coins are flipped?Page 2
Employees of KB and SONS Consultants Limited are paid at an hourly basics of 25GHS per an hour for regular hours and 1.5 times per hour for overtime hours in a week. Any hour worked over 40 hours per week is overtime. The following national tax sliding scale is then applied to determine the amount of tax to be paid by an employee. GrossWage Tax Rate (%) First 125 0 Next 125 5 Next 1500 10 Next 2750 15 Next 1250 20 Excess over 5000 30 In addition 6% of an employee’s gross wage is withheld for Social Security, 3% is withheld as constituency tax and 20GHS is withheld by the employer as welfare contribution. If an employee has more than 3 dependants then an amount of 5GHS for each dependant in excess of three towards NHIS. You are required to write a program that compute a workers gross pay, the deductions and his/her net pay. Your program should allow details of the staff to be accept /input into the system for the necessary computations. Try using comments in explaining the flow of the…
Two brother X and Y appeared for an exam. The probability of selection of X is 1/7 and that of B is 2/9. Find the probability that both of them are selected.
Sam is a competitive swimmer that competes in the 100 m freestyle and 100 m backstroke. High school swimming state averages are as follows: Freestyle: mean time 72.39 seconds, standard deviation 3.7 seconds Backstroke: mean time 81.09 seconds, standard deviation 4.1 seconds If Sam's times were 71.1 seconds in freestyle and 80.1 seconds in backstroke, select the correct words to describe how his times compare to each other. Since the z-score in freestyle is ["", ""] than the z-score in backstroke, his time in freestyle is ["", ""] when compared to the rest of the swimmers in that event.
Hat-check problem. Use indicator random variables to solve the following problem, which is known as the hat-check problem. Each of n customers gives a hat to a hat-check person at a restaurant. The hat-check person gives the hats back to the customers in a random order. What is the expected number of customers who get back their own hat?
ne. ta nown that the IQ scores of people in the United States have a normal distribution with mean 100 and standard deviation 15. If a person is selected at random, find the probability that the person's IQ score is less than 85.
2 To 000 Total = 0 TL 1 001 Total = 0.5 TL 1 010 Total = 1 TL A Coca-Cola vending machine can accept coins of value 0.5 TL (Turkish Lira) and 1 TL. The door (output hole) of the vending machine is released (i.e. a Coca-Cola can is dropped/sold) when the amount of money received is equal to or greater than 2.5 TL. Assume that the machine accepts one coin at a time. Also assume that the machine goes to the initial state after releasing the door. Complete the given ASM chart according to the above description. Hint: = 1 iff a coin of value 0.5 TL is input to the machine. input signal x input signal y = 1 iff a coin of value 1 TL is input to the machine.
Randomly generate 15 numbers rounded to 2 decimal places using the Numpy random function “normal()” with a mean of 20 and standard deviation of 5. Use seed of 1. Create a Pandas series of these 15 randomly generated numbers. Suppose that these numbers represent hourly wages of fifteen workers. Use a Pandas functions determine the average wage rate and the corresponding sample standard deviation Use a Boolean mask and Pandas function determine how many workers make less than $15 per hour Use a Boolean mask and Pandas function generate summary descriptive statistics for those earning less than $20 an hour Suppose that 5% raise for all individuals is approved. Create a new Pandas series for the new wage rate rounded to 2 decimal places
World Series odds Consider two teams, A and B, playing a series of games until one of the teams wins n games. Assume that the probability ofA winning a game is the same for each game and equal to p, and the probability of A losing a game is q = 1− p. (Hence, there are no ties.) Let P(i, j) be the probability of A winning the series if A needs i more games to win the series and B needs j more games to win the series. a. Set up a recurrence relation for P(i, j) that can be used by a dynamic programming algorithm. b. Find the probability of team A winning a seven-game series if the proba-bility of it winning a game is 0.4. c. Write pseudocode of the dynamic programming algorithm for solving this problem and determine its time and space efficiencies.