Question
A light bulb manufacturer claims that, on average, their light bulbs burn for 3000 hours with a standard deviation of 1000 hours. You are the
A light bulb manufacturer claims that, on average, their light bulbs burn for 3000 hours with a standard deviation of 1000 hours. You are the maintenance manager for Turner Field and you installed 400 of these light bulbs in one of the light standards at the ballpark. Assume the manufacturer’s claim is correct.
a) What is the probability that the average life time for these bulbs is greater than 3075 hours?
b) What is the probability that the average life time for these bulbs is between 2960 hours and 3095 hours?
c) You tracked the life times of all of the bulbs that you installed and determined that the mean life time for these bulbs was 2900 hours. What, if anything, does this tell you about the manufacturer’s claim?
Step by Step Solution
3.50 Rating (150 Votes )
There are 3 Steps involved in it
Step: 1
a We first get the z score for the critical value As z x u sqrtn s then as x critical value 3075 u m...
Get Instant Access to Expert-Tailored Solutions
See step-by-step solutions with expert insights and AI powered tools for academic success
Step: 2
Step: 3
Document Format ( 2 attachments)
635de1c40b4f2_179667.pdf
180 KBs PDF File
635de1c40b4f2_179667.docx
120 KBs Word File
Ace Your Homework with AI
Get the answers you need in no time with our AI-driven, step-by-step assistance
Get Started
Data Analysis And Decision Making
Authors: Christian Albright, Wayne Winston, Christopher Zappe
4th Edition
538476125, 978-0538476126
