The probabilities that a particular office phone rings 0, 1, 2, 3 times in half hour are respectively: 0.05, 0.15, 0.21, 0.42. Find the probability that the phone rings at least 4 times between 3:30-4:00 pm.

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...
icon
Related questions
Question

The probabilities that a particular office phone rings 0, 1, 2, 3 times in half hour are respectively: 0.05, 0.15, 0.21, 0.42. Find the probability that the phone rings at least 4 times between 3:30-4:00 pm. 

Expert Solution
trending now

Trending now

This is a popular solution!

steps

Step by step

Solved in 2 steps

Blurred answer
Similar questions
Recommended textbooks for you
A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
Probability
ISBN:
9780134753119
Author:
Sheldon Ross
Publisher:
PEARSON
A First Course in Probability
A First Course in Probability
Probability
ISBN:
9780321794772
Author:
Sheldon Ross
Publisher:
PEARSON