Problem No.9A class in Engineering Data Analysis for CE is composed of 10 juniors, 30 seniors, and 10graduate students. The final grades show that 3 of the juniors, 10 of the seniors, and 5 of thegraduate students received 1.00 for the course. If a student is chosen at random from thisclass and is found to have earned 1.00, what is the probability that he or she is a senior?

Answered: Problem No.9 A class in Engineering…

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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Question 4: The percentage of adult smart phone users who use TikTok has increased over time. Assume that 52% of adult smart phone users are in age group 12-21. Of the adult smart phone users in age group 12-21, 81% use TikTok. Of the adult smart phone users in age group 22 and older, 54% use TikTok. What is the probability that a randomly selected adult smart phone user is of age group 22 or older? b. Given that adult smart phone user belong to age group 22 and older, what is the probability that he/she uses TikTok? What is the probability that adult smart phone user belongs to age group 12-21 and do not use TikTok? d. Given that adult smart phone user uses TikTok, what is the probability that he/she belong to age group 12-21?
QUESTION 8 You are given the following table with joint probabilities for X and Y (i.e. bivariate probability distribution). 0.12 0.42 0.06 0.6 0.3 0.1 y 1 0.21 0.06 0.03 0.07 0.02 0.01 0.4 0.5 0.1 1.00 The expected value of Y is: E[Y] = 0×0.3 + 1×0.6 + 2×0.1 = 2.90 O True O False o o o
QUESTION 1 The number of car accidents in small city caused by reckless drivers has heighted concern over the road safety. The traffic authorities of the city recorded a daily average of two such accidents. The probability that a) There are less than 3 accidents in a single day b) There are at least 5 accidents in three days
QUESTION 14 A research study uses 800 men under the age of 60. Suppose that 40% carry a marker on the male chromosome that indicates an Increased risk for high blood pressure. If 10 men are selected randomly and tested for the marker, the probability that exactly 1 man has the marker is O a.0.27 O b. 0.04 O c. 0.072 O d. 0.19
QUESTION 4 An IT company employs 16 Computer Engineers, 23 Software Engineers and 22 Network Engineers. One enigineer will be randomly selected to be "Employee of the Month" What is the probability that the selected employee will be a Software Engineer? Round your answer to four decimal places.
Question 5: According to the Pew Internet & American Life Project, 54% of Internet users have a wireless connection to the Internet via a laptop, cell phone, game console, or other mobile device. Given that users have a wireless, 25% use Twitter to share updates about themselves. What is the probability that an Internet user has a wireless connection and also uses Twitter? O 54% +25% -79% 25%/54%-46.3% 54%/25%-2.16 54% 25 % -13.5%
Question 1. Compilation of results from a clinical trial reveals that 475 of 601 cases survive at least 5 years after diagnosis. Based on this information, estimate the probability of surviving at least 5 years.a. Probability of surviving at least 5 years is estimated to be 0.79 b. Probability of surviving at least 5 years is estimated to be 0.50c. Probability of surviving at least 5 years is estimated to be 0.21 d. Probability of surviving at least 5 years is estimated to be 1.27
QUESTION 11 A critical thinking professor asked her students to indicate whether they believed each of two headlines. One headline was false, and the other was true, but the students did not know this. The probability that a student selected at random believed the true headline was 89% and the probability that the student believed the false headline was 85%. She found that 7896 of the students believed both headlines. a. In this sample, are the events "believed the false headline" and "believed the true headline" mutually exclusive? Explain b. Find the probability that a randomly selected student from this sample believed the true headline OR believed the false headline. T TTT Paragraph Arial 3 (12pt) T O Mashups HTML CSS Words:0 Path: p Click Save and Submit to save and submit. Click Sae All Answers to save all answers. >8 0
Question 13, section 4.2
Question 24 Suppose that 29% of people have dogs. If two people are randomly chosen, what is the probability that they both have a dog? Write your answer as a percent and round to the nearest hundredth of a percent. There is a % chance the two randomly chosen people both have dogs.
QUESTION 4 d&e - problem-type question requiring detailed written answers. The members of a sports club were concerned about the effect of the weather on the outcome of their cricket matches. The results for the 75 matches played were recorded in the following table: Results Weather Good Bad TOTAL Win 17 9 26 Draw 9 10 19 Lose 7 23 30 TOTAL 33 52 75 If a match was selected at random, what is the probability that: The weather was good or the sports club win the match. Are the events “Win” and “Lose” the…
Question 9 A batch of 400 LEDS contains 7 that are defective. This is known to be the long-term average for the production. The company sells boxes with 50 LEDS in each box. (a) What is the probability there are 1 or more defective bulbs in a box? (b) If three LEDS are selected at random from a box, what is the probability that the third one selected is defective given that the first one selected was not defective and the second one selected was defective? (c) Boxes are returned if 3 or more are defective. What is the probably a box will be returned?

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