Suppose that only 20% of all drivers come to a complete stop atan intersection having flashing red lights in all directions when noother cars are visible. What is the probability that, of 20randomly chosen drivers coming to an intersection under theseconditions,a) At most 7 will come to a complete stop?b) Exactly 6 will come to a complete stop?At least 4 will come to a complete stop?1.c)d)How many of the next 20 drivers do you expect to come to acomplete stop?2. An examination consists of 10 multi-choice questions, in each ofwhich a candidate has to deduce which one of five suggested answersis correct. A completely unprepared student may be assumed toguess each answer completely randomly. What is the probability thatthis student gets 8 or more questions correct?

(1a) Obtain the probability at most 7 will come to a complete shop. The probability that at most 7…

Suppose that only 20% of all drivers come to a complete stop at an intersection having flashing red lights in all directions when no other cars are visible. What is the probability that, of 20 randomly chosen drivers coming to an intersection under these conditions, a) At most 7 will come to a complete stop? b) Exactly 6 will come to a complete stop? c) At least 4 will come to a complete stop? d) How many of the next 20 drivers do you expect to come to a complete stop?

Suppose that only 20% of all drivers come to a complete stop at an intersection having flashing red lights in all directions when no other cars are visible. What is the probability that, of 20 randomly chosen drivers coming to an intersection under these conditions, a) At most 7 will come to a complete stop? b) Exactly 6 will come to a complete stop? c) At least 4 will come to a complete stop? d) How many of the next 20 drivers do you expect to come to a complete stop?

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...

See similar textbooks

Similar questions

Of the 8000 students in Hunter College, 5000 takes statistics, 2600 takes chemistry, and 800 takes both. Suppose a random student is selected. What is the probability that he/shea) Takes neither? b) Takes statistics but not chemistry?
a group of 200 students includes 120 who watch television news, 80 who read a newspaper, and 60 who watch television and read a newspaper. if a student is selected at random, find the probability that the student will a) watch television news or read a newspaper? b) neither watch television news nor read a newspaper? c) only watch television news? d) only read a newspaper?
Assume this year's flu vaccine has a 80% chance of being effective. If the vaccine is given to 333 randomly selected people, answer the following. d) What is the probability that exactly 264 of them did not get the flu? Round final answer to 4 decimal places. e) What is the probability that less than 264 of them did not get the flu? Round final answer to 4 decimal places. f) What is the probability that more than 264 of them did not get the flu? Round final answer to 4 decimal places.
A random sample of 250 working adults found that 74% access the Internet at work, 88% access the Internet at home, and 72% access the Internet at both work and home. a) Find the probability that a person in this sample selected at random accesses the Internet at home or at work? b) Find the probability that a person in this sample selected at random accesses the Internet at home only? c) How many people in this sample do not access the Internet at work or at home?
4. A gumball machine contains 60 gumballs of which 15 are yellow, 25 are pink, and 20 are blue. To operate the machine, you put a nickel into the slot and a random gumball is dispensed. If you buy 10 gumballs, what is the probability that: a) You get 2 yellow gumballs? b) All the gumballs are the same color?
A data from a college shows that a certain exam has 10% passing rate. If 4 students take this exam, Find: a) probability that all of them pass it b) probability that no one pass it c) probability that at least one of them fails
According to CTIA, 41% of all U.S households are wireless-only households (no landline). In a random sample of 20 households, what is the probability that- a) Exactly 5 are wireless-only b) Fewer than 3 are wireless-only c) At least 3 are wireless-only d) The number of households that are wireless-only is between 5 and 7, inclusive?
Twenty subjects volunteer for a study of a new cold medicine. Eight of the volunteers are ages 20-39, 6 are ages 40-59, and 6 are age 60 or older. If 8 volunteers are selected at random, find the following probabilities. a) the probability that all the volunteers selected are ages 20-39 b) the probability that 4 of the volunteers are ages 20-39 and 4 are age 60 or older. c) the probability that 4 of the volunteers are ages 40-59
4) In Toronto, Canada, 55% of people pass the drivers’ road test. Suppose that 100 people take the test. d) What is the probability that at least 49 passed? e) What is the probability that at most 45 passed?
According to an SSA study, around 36% of 65-year old women will live to at least 90. If 4 65-year old women are randomly selected, find the probability that ... (Round the answers to 4 decimal places.) a) ... none of them will live to at least 90: b) ... 2 of them will live to at least 90: c) ... at most 3 will live to at least 90: