According to a 2017 Wired magazine article, 40% of e-mails that are received are tracked using software that can tell the e-mail sender when, where, and onwhat type of device the e-mail was opened (Wired magazine website). Suppose we randomly select 50 received e-mails.a. What is the expected number of these e-mails that are tracked?b. What are the variance (to the nearest whole number) and standard deviation (to 3 decimals) for the number of these e-mails that are tracked?VarianceStandard deviation

Let's consider the variable X the number of emails tracked, with a binomial distribution, a…

Answered: According to a 2017 Wired magazine…

ENGR.ECONOMIC ANALYSIS

14th Edition

ISBN:9780190931919

Author:NEWNAN

Publisher:NEWNAN

Chapter1: Making Economics Decisions

Section: Chapter Questions

Problem 1QTC

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Suppose the profit a Honda dealership makes on the next 5 Accords it sells are:504, 1,027, 867, 1,434, 1,372. Calculate the standard deviation of the sample. (please express your answer using 2 decimal places).
An equipment proposal from two vendors A and B have been received from a local company. The quality of these equipment have been varying and consequently the cost of manufacturing the product using these two different equipment has also varied. The varying costs based on the probabilities of defects are given in table below.Determine the better vendor.
A local university has a student population that is 57% male. 64% of the students are undergraduates; 40% are both male and undergraduates. What is the probability that a randomly selected student is either male or an undergraduate?
2
A small retail store has customers whose ages are normally distributed, with a mean of 37.5 and a standard deviation of 7.6. What is the probability that a randomly selected customer is younger than 25 years old? Round your answer to three decimal places, e.g. 0.685.
A campus finance officer finds that, for all parking tickets issued, fines are paid for 78% of the tickets. The fine is $2. In the most recent week, 620 parking tickets have been issued.a. Find the mean and standard deviation of the number of these tickets for which the fines will be paid.b. Find the mean and standard deviation of the amount of money that will be obtained from the payment of these fines.
An analysis of the grades on the first test in History 101 revealed that they approximate a normal curve with a mean of 75 and a standard deviation of 8. The instructor wants to award the grade of A to the upper 10% of the test grades. To the nearest percent, what is the dividing point between an A and a B grade?
Consider the following interaction between a student and a company. The student is either serious or lazy with probabilities 1/3 and 2/3 respectively. The student knows if they are serious or not, but the company does not. Initially, the student decides whether to revise for exams or not. Revising has a cost of 1 for a serious student and 3 for a lazy one. The company observes the student's exam result (that is, whether they have made the effort to revise), and based on this, offers a salary of 3 (for a serious student) or 1 (for a lazy student). The student learns of the proposed salary and can then either accept (and earn the salary) or refuse (and earn O). They also lose the revision effort if they worked. The company's gain is equal to the student's productivity (4 if they are serious, 2 if not) minus the salary if the student accepts the offer, and O otherwise. 1. Represent the game in extensive form. 2. Show that the game has a unique perfect Bayesian Equilibrium, and provide the…
Industry standards suggest that 12 percent of new vehicles require warranty service within the first year. University Toyota in Morgantown, WV sold 10 Toyotas yesterday. What is the probability that exactly one of these vehicles will require warranty service?
A researcher believes that 8% of pet dogs in Europe are Labradors. If the researcher is right, what is the probability that the proportion of Labradors in a sample of 630 pet dogs would be greater than 7%? Round your answer to four decimal places.
7. The amount spent by a customer on a Summer Cruise has a normal distribution with a mean of $95.60 and a standard deviation of $5. a) Calculate the probability that a randomly selected customer spends less than $95. b) The probability that customers spend more than x dollars is 0.2810. Find the value of r.

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