C Chegg Study I Guided se x y Hw a7 ISections 42-46) x C www.webassign Responses
ID: 3218056 • Letter: C
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C Chegg Study I Guided se x y Hw a7 ISections 42-46) x C www.webassign Responses/Ma 15985790 gn.net/web/Student/Assignment Apps Bookmarks UITAR TABs AND CH Make Payment Bea Courses Blackboard Mail Rashid, Umer C matlab-a-practica-in D Membe wepe D virginia Community C M Inbox (3) 241 (e) PIX 13 I s 2 Need Help? Read t Talk to a Tutor -3 points Devorestat9 4.E.044. 030 Submissions Used My Notes Ask Your Teacher If bolt thread length is normally distributed, what is the probability that the thread length of a randomly selected bolt is (a) Within 0.7 SDs of its mean value? (b) Farther than 2.5 SDs from its mean value? (c) Between 1 and 2 SDs from its mean value? You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help? Read It Talk to a Tutor 5. -4 points DevoreStat9 4.E.059. 030 Submissions Used My Notes. Ask Your Teacher Let X the time between two successive arrivals at the drive-up window of a local bank. If X has an exponential distribution with M-1, (which is identical to a standard Mr A 6-13 P Al 4/5/2017Explanation / Answer
a) P(within 0.7SDs of mean) = P(-0.7 < Z < 0.7 )
= P(Z<0.7) - P(Z<-0.7)
= 0.7580 - 0.2420 = 0.5160
b) P(within 2.5SDs of mean) = P(-2.5 < Z < 2.5 )
= P(Z<2.5) - P(Z<-2.5)
= 0.9938 - 0.0062 = 0.9876
c) P(within 1 and 2 SDs of mean) = 2[P(Z<2) - P(Z<1)]
= 2[0.9772 - 0.8413]
= 0.2718
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