Mathematical Methods CAS Exam 2 Discussion - How was it??

[HCbigstick]

Did anyone get 0.4103 for part 2e? I'm not sure about that one.

YESSSSSSSSS I was quite uncertain about that one

Lol i got that. What method did people use to solve it? Mine was weird.

I did

Pr(X>3) / [ Pr(X>3) + Pr(Y>3) ]

+1. I did the same thing and got 26/49 which was 0.5306 to 4 dp. Anyone else?

Pr(Chocolate A|Dark Chocolate)=Pr(Dark Chocolate A)/Pr(Dark Chocolate)=Pr(X>3)/(Pr(X>3)+Pr(Y>3))=0.5/(0.5+23/32)=0.4103

Oh god. I did 23/52 instead of 23/32! One mark lost only, surely?

[duquesne9995]

does anyone remember was 1a worth 3 marks?
=\
will i get any method marks if i just let x^2/5 = 6075 and solve ?

[Anon123]

does anyone remember was 1a worth 3 marks?
=\
will i get any method marks if i just let x^2/5 = 6075 and solve ?

You will probably only get 1 mark for that :S
You were certainly meant to show the formula for the amount of water
-use T as the variable (or whatever its called)
-Show the formula = 0
-and then just show the answer with units

Sorry, but you would only get 1-2/3 for that, they dont give 3 marks like that

[Mario]

thats the wrong answer anyway isnt it? wasnt it some other answer like u had to diff it or some shit, i did the same thing as you but others did it

does anyone remember was 1a worth 3 marks?
=\
will i get any method marks if i just let x^2/5 = 6075 and solve ?

some other way lol

[BlueSky_3]

I had what acinod got for the probability question which is just an application of conditional probability.

[ShortBlackChick]

This is probably a been-there-done-that comment but...
TASMANIA JONES STRIKES AGAIN!!

And lost me 10 marks for questions I didnt do because I ran out of time!!!

[Nomad93]

You've gotta love the wording of these questions:

"A bunch of chocolate is in a bin. When it gets pulled out of the bin, the probability that it is darker is..."

Anyone have a copy of the exam?

[BubbleWrapMan]

Was E(Y) = 4.333?

[mickeymouse]

Was E(Y) = 4.333?

lets hope so I got that answer too!

[luken93]

Was E(Y) = 4.333?

not according to iTute, but that's what I got :S

[ttn]

Can't remember what I got but was it just simply antidiffing them with y multiplied? then adding them together?

[mattshen]

Was E(Y) = 4.333?

not according to iTute, but that's what I got :S

I'm quite sure it was 4.333 as well =="

[Inside Out]

What SS woyld i get if i lost 20 marks for both exams

[Hamdog17]

Yeah E(Y)=4.333  (I hope)

[BubbleWrapMan]

Raaaaaage, itute has to be wrong, if you graph it the mean would be way closer to 4.333 than 1.439