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Vor Charles S p Do Homework - Trevor Perry - Google Chrome c o O open as Secure https://www.mathxl.com/Student/PlayerHomework.aspx?homeworkld=454349873&questionld;=78flushed=false&cid;=4724730¢erwinEyes; Bookmarks S TUESDAY / THURSDAY STT 315 Trevor Perry 8 II | 9/26/17 2:49 PM R. A G Trevor Homework: Home work 3 - Chapter 2.5 - 2.8,2.10 save MyStatLab Score: 0 of 1 pt 11 of 15 (5 complete) HW Score: 14%, 7 of 50 pts LI 2.6.100 IE Question Help O e Suppose you buy a new car whose advertised mileage is 21 miles per gallon (mpg). After driving your car for several months, you find that its mileage is 17.3 mpg. You telephone the manufacturer and learn that the standard deviation of gas mileages for all cars of the model you bought is 1.11 mpg. a. Find the z-score for the gas mileage of your carassuming the advertised claim is correct. b. Does it appear that your car is getting unusually low gas mileage? o My Courses Course Home a . z=-3.3) (Round to two decimal places as needed. ) Assignments Study Plan Gradebook StatCrunch eText Chapter contents Tools for Success Multimedia Library Enter your answer in the answer box and then click Check Answer Purchase options 1 remaining Clear All Check Answer remaining Discussions Course Tools HOW P3 xD AN o. G GREE 3 2:50 PM n, D 1. 9/26/2017Explanation / Answer
mean is given as 21
x is 17.3
sd is 1.11
a) z=(x-mean)/sd =(17.3-21)/1.11=-3.33
b) yes, anything below 3 standard deviations is out of range
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