A door-to-door salesman expects to make a sale 22% of the time when starting the day. But making a sale increases his enthusiasm so much that the probability of a sale to the next customer is 0.4. If he makes no sale, the probability for a sale to the next customer stays at 0.22. What is the probability that he will make at least two sales with his first three visits?

A door-to-door salesman expects to make a sale 22% of the time when starting the day. But making a sale increases his enthusiasm so much that the probability of a sale to the next customer is 0.4. If he makes no sale, the probability for a sale to the next customer stays at 0.22. What is the probability that he will make at least two sales with his first three visits?

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

The (hypothetical) table below shows the relationship between the number of hours students work at part-time jobs each week and the number of years it takes then to graduate with an undergraduate degree. If a student works more than 5 hours per week, what is the probability that the student graduates in over 6 years?
Every summer, Madison goes on a week- long canoe trip with her childhood camp friends. After the trip, she usually purchases some oars from the destination city. Her collection of oars is organised by year and type of wood. The probability that an oar was purchased in 2013 is 0.4, the probability that it was made from spruce wood is 0.4 and the probability that it was purchased in 2013 and was made from spruce wood is 0.1. What is the probability that a randomly chosen oar was purchased in 2013 or was made from spruce wood?
The probability that a student passes Math is 2/3, and the probability that he passes English is 4/9. If the probability of passing at least one course is 4/5, what is the probability that he will pass both courses?
Ali has taken two books with him for holiday. The probability of liking the first book is 0.5, the probability of liking the second book is 0.4, the probability of liking both books is 0.3. What is the probability that Ali does not like both books?
The probability that a certain plant will survive in the month of July is 2/5, and the probability that it will still live up to August is 4/11. Find the probability that this plant will still alive in August.
A drunken pirate stands in the center of a ship's deck. Every second the pirate moves right or left only. Every second the pirate moves to the right with a probability of 0.1 The steps are independent of each other. The edge of the deck is 5 steps away from the pirate. What is the chance that the pirate will fall off the ship after exactly 5 seconds?
You are the webmaster for your firm's website. From your records, you know that the probability that a visitor will buy something from your firm is 0.26. In one day, the number of visitors is 1050. If the visitors' traffic is more than the expected for the day, what is the probability that at least 10 more than the expected visitors will buy something from the firm?
Liam is playing badminton against his brother and the probability that he wins against his brother is 0.3. What is the probability that on a given day, Liam wins for the first time on the 5th or 6th set played?
Professor John is designing a water flask and he needs to know the probability that the filtration system will fail during a water cleaning. Based on previous data, Professor John estimates that the probability of a filtration system failure during the filtration cleaning is 0.05. If the water flask is used for 365 days in a year, what is the probability that the filtration system will not fail during any cleaning in a year?
An anthropologist wants to determine the probability that exactly 15 out of 25 ancient civilizations collapsed because of poor leadership. If the probability of the civilizations collapsing because of poor leadership is 72%, the number of trials is and the number of successful trials is The probability that exactly 15 out of 25 civilizations collapsed because of poor leadership is
Frank noticed that his mother will serve salad with dinner 78% of the nights, will serve potatoes with dinner 30% of the nights and will serve both 14% of the nights. The probability, to the nearest hundredth, that Frank's mother will serve salad or potatoes is
The only grades possible in a history course are A, B, C,D,F. The probability that a student will get an A is 0.19. The probability of getting a B is 0.31. The probability that a student will get a C is 0.28. The probability that the student will get a D is 0.18, and the probability of getting an F is 0.04 (a) what is the probability that a student will an A or F.? (b) what is the probability that a person will get an A or B or C? (c) what is the probability that a student will get a C or a D? round your answer to decimal places