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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Q: QUESTION 1 In 2003, Major League Baseball took steps to speed up the paly of baseball games and make…

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A: XA=100     nA=400XB=20       nB=120XC=65       nC=300

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A: mean = 22.5 sigma = 9.72 n = 50 The standard error is given by SE = σn SE = 9.7250 SE = 1.375