Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours. n USE SALT (a) For a package selected at random, what is the probability that it will be delivered in 18 hours or less? (Round your answer to four decimal places.) (b) What should be the guaranteed delivery time on all packages in order to be 90% sure that the package will be delivered before this time? (Hint: Note that 10% of the packages will be delivered at a time beyond the guaranteed time period.) (Round your answer to one decimal place.) hr

Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours. n USE SALT (a) For a package selected at random, what is the probability that it will be delivered in 18 hours or less? (Round your answer to four decimal places.) (b) What should be the guaranteed delivery time on all packages in order to be 90% sure that the package will be delivered before this time? (Hint: Note that 10% of the packages will be delivered at a time beyond the guaranteed time period.) (Round your answer to one decimal place.) hr

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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Concept explainers

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.

Question

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Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours.
In USE SALT
(a) For a package selected at random, what is the probability that it will be delivered in 18 hours or less? (Round your answer to four decimal places.)
(b) What should be the guaranteed delivery time on all packages in order to be 90% sure that the package will be delivered before this time? (Hint: Note that 10% of the packages will be
delivered at a time beyond the guaranteed time period.) (Round your answer to one decimal place.)
hr

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