ATAR Notes: Forum
VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematical Methods CAS => Topic started by: bec036 on November 07, 2010, 08:49:12 am
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2009 VCAA:
Question 3d.
These answers are better than VCAA in terms of working ....
http://www.itute.com/wp-content/uploads/2009-vcaa-mathematical-methods-cas-exam-2-solutions-v2.pdf
Both VCAA and this say Pr(X<68.4) = 0.995 and I have no clue how to get that! I can get 0.99 which was a "commonly used incorrect value" but 0.995 throws me!
I bet its really simple and I just cant see it! :'(
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The question states that:-
'BBC management wants engineers to change the manufacturing process so that 99% of all balls produced have diameter between 65.6 and 68.4 mm.'
Therefore Pr(65.6<X<68.4)=0.99
If you draw the normal dist. graph and the points 65.6 and 68.4, 99% of the probability will be between those points and 1% will be outside those points.
Therefore Pr(X<65.6)=0.005 and Pr(X>68.4)=0.005 (Forgot the extra 0's)
Then you'll understand that Pr(X<68.4)=0.995
Hope this helps :)
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Oo that makes sense I knew it had something to do with the graph but couldn't work it out! Thank you so much! it seems so simple now :)
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No problem :)
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One of those questions is really tricky only 2% got full marks I think, subtle conditional probability aha
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One of those questions is really tricky only 2% got full marks I think, subtle conditional probability aha
Was that 3ci? Cause if it was yay! On of the ones i got right haha.
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The question states that:-
'BBC management wants engineers to change the manufacturing process so that 99% of all balls produced have diameter between 65.6 and 68.4 mm.'
Therefore Pr(65.6<X<68.4)=0.99
If you draw the normal dist. graph and the points 65.6 and 68.4, 99% of the probability will be between those points and 1% will be outside those points.
Therefore Pr(X<65.6)=0.005 and Pr(X>68.4)=0.005 (Forgot the extra 0's)
Then you'll understand that Pr(X<68.4)=0.995
Hope this helps :)
ANI YOU GENIUS!!!! ANI YOU GENIUS!!!
This guy likes to be called Ani, so when you get to thank him, call him Ani. :D
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haha okay!
ANI thank you :)
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ANI YOU GENIUS!!!! ANI YOU GENIUS!!!
This guy likes to be called Ani, so when you get to thank him, call him Ani. :D
Andrew, I don't think I hit you hard enough with that ruler this morning. :uglystupid2:
Ps - Methods today = FAIL :'(
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haha okay!
ANI thank you :)
Good work! :)
ANI YOU GENIUS!!!! ANI YOU GENIUS!!!
This guy likes to be called Ani, so when you get to thank him, call him Ani. :D
Andrew, I don't think I hit you hard enough with that ruler this morning. :uglystupid2:
Ps - Methods today = FAIL :'(
DUDE... MY methods was faillllll.