Software filters rely heavily on "blacklists" (lists of known "phishing" URLs) to detect fraudulent e-mails. But such filters typically catch only 21 percent of phishing URLs. Jason receives 18 phishing e-mails. (a) What is the expected number that would be caught by such a filter? (Round your answer to 2 decimal places.)| Expected number | _______________ | (b) What is the chance that such a filter would detect none of them? (Round your answer to 5 decimal places.)| Probability | _______________ |

Answered: Image /qna-images/answer/024e1496-a9c8-44f1-9c38-cfd84335bc86.jpg

Answered: Software filters rely heavily on…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Similar questions

It is known that 70% of adult workers have a high school diploma. If a random sample of 25 adult workers is selected, what is the expected number of them that would have a high school diploma?
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As of May 2020, according to Gallup, about 46% of Americans polled "evaluate their lives well enough to be considered 'thriving'." Suppose you are in a class of 35 students. Write your calculator commands used for c-e (no hand calculations allowed). What is the probability that no more than 12 students in the class will say that they "evaluate their lives well enough to be considered 'thriving'?"
suppose we select an SRS of 1010 adults. If it is believed that 60% of all adults are very satisfied with their lives, what is the probability that at least 610 adults in our sample are very satisfied with their lives?Let X be the number (out of 1010) of adults who are very satisfied with their lives. What distribution should X have? Why?
Suppose the percentage of those completing a master’s degree is 42%. In a randomsample of 9 master’s degree students, what is the probability that exactly 5 willcomplete their degrees?
please answer the question down below!
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We believe that 95% of the population of all Elementary Statistics students consider Statistics an exciting subject. Suppose we randomly and independently selected 20 students from the population. If the true percentage is really 95% find the probability of observing 19 or more of the students who consider statistics to be an exciting subject in our sample of 20.
Based on historical data, your manager believes that 31% of the company's orders come from first-time customers. A random sample of 119 orders will be used to estimate the proportion of first-time-customers. What is the probability that the sample proportion is between 0.24 and 0.37?
A manufacturing machine has a 5% defect rate. If 10 items are chosen at random, what is the probability that at least one will have a defect?
In a large city, 55% of people pass the drivers' road test. Suppose that every day, 200 people independently take the test a. What is the number of people who are expected to pass? The expected number is. (Round to the nearest whole number as needed.)
Words that are more likely to be contained in a phishing scam are called flagged words. Typically, there is a 94% chance that a phishing scam contains flagged words. There is a 20% chance that regular email contains flagged words. A security company estimates that 4.9% of emails are phishing scams. An email just came through that contains a flagged word. What are the chances that it is a phishing scam? (Enter the probability as a decimal rounded to four decimal places.)

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