Question 2 The time for an older machine to do a quality check on a newly manufactured tire, X1, has mean of 65 seconds and variance 16, while the time for a newer model, X2, has mean 45 seconds and variance 9. Find the expected time savings using the newer model when a) checking a single tire; b) checking 200 tires. c) Find the standard deviation in parts a) and b), assuming all the checking times are independent.

Question 2 The time for an older machine to do a quality check on a newly manufactured tire, X1, has mean of 65 seconds and variance 16, while the time for a newer model, X2, has mean 45 seconds and variance 9. Find the expected time savings using the newer model when a) checking a single tire; b) checking 200 tires. c) Find the standard deviation in parts a) and b), assuming all the checking times are independent.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter10: Statistics

Section10.5: Comparing Sets Of Data

Problem 1CYU

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Question

Question 2 The time for an older machine to do a quality check on a newly manufactured tire,
X₁, has mean of 65 seconds and variance 16, while the time for a newer model, X₂, has mean 45 seconds and variance 9. Find the expected time savings using the newer model when
a) checking a single tire;
b) checking 200 tires.
c) Find the standard deviation in parts a) and b), assuming all the checking times are
independent.

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