VCE Methods Question Thread!

[Stevensmay]

Same here.I wasn't aware of the conditional probability when I was doing it so bascially I did the numerator part only.
Your solution is just too perfect !! I totally get it now. Thanks but is there a technique to look out whether it is a conditional probability or not?

That one was one of the more difficult ones to realise that it was conditional.
'Daniel receives telephone calls on both Monday and Tuesday' was the statement which tells us it was conditional.
Generally anything that isn't directly asking you to find the probability of it will often be key in some other way, in this case as a condition. Other things to watch out for are 'given that', 'if', and 'when,' although above shows that these aren't always used.

[Damoz.G]

Another question from vcaa 2012 exam 2 Q2e. http://www.vcaa.vic.edu.au/Documents/exams/mathematics/2012/2012mmcas2-w.pdf
If they want u to go back to original, dont u use T,R,D instead of dilation-->reflection-->translation because a lecturer told us this. and I don't get how their second solution from the start.

iTute explains it well.

Have you had a look here yet? http://www.itute.com/wp-content/uploads/2012-vcaa-mathematical-methods-exam-2-solutions.pdf

[LOLs99]

Ok, I get it now. Thankyou Stevensmay and Damoz

[clıppy]

Going back to some combinatorics and factorials here:

Let X be a binomial variable with parameters n = 50 and p = 2/3

a) Simplify the ratio

b) Simplify the ratio

c) Find the smallest value of k for which Pr(X=k) is greater than Pr(X = k+1)

I've mostly gotten lost on how to simplify the    bits, so some help would be much appreciated.

[Alwin]

Going back to some combinatorics and factorials here:

Let X be a binomial variable with parameters n = 50 and p = 2/3

a) Simplify the ratio

b) Simplify the ratio

c) Find the smallest value of k for which Pr(X=k) is greater than Pr(X = k+1)

I've mostly gotten lost on how to simplify the    bits, so some help would be much appreciated.

Hint:

I think you got the rest

[Jaswinder]

with the ti-inspire calculators, you can define equations and let it equal to something and the calculator tells you if its true or false. How do we do that on CASIO CLASSPAD 330? 

[Alwin]

with the ti-inspire calculators, you can define equations and let it equal to something and the calculator tells you if its true or false. How do we do that on CASIO CLASSPAD 330? 

Judge.

[Stevensmay]

with the ti-inspire calculators, you can define equations and let it equal to something and the calculator tells you if its true or false. How do we do that on CASIO CLASSPAD 330? 

I've been hearing something about a 'judge' function?

http://mesc-maths-year12-further.wikispaces.com/file/view/classpad300+how+do+i.pdf
Page 14.

[sasa]

Main
Keyboard
cat
J
judge(
Type the first expression and then "=" then the second expression, close bracket press EXE

It should say TRUE or FALSE
But it acts up sometimes, idk why, but it might say undefined or something which could be true or false

But that's only sometimes (mainly really big expressions) most of the time it's fine, like it's perfect for the VCAA multiple choice

BasicAcid, have you tried updating your system? My teacher did that to mine and now it works fine....or that I'm sure that that has a lot to do with it but eh

[YouAreNowReadingMyName]

Are you allowed to bring in 2 calculators in the exam?

[Stevensmay]

Are you allowed to bring in 2 calculators in the exam?

One scientific and one CAS is all that is allowed I believe.

Mathematical Methods (CAS) Examination 2
• One approved CAS calculator or CAS software and, if
desired, one scientific calculator

http://www.vcaa.vic.edu.au/Documents/vcaanavigator_web.pdf Pg 7

[LOLs99]

I have a ques .

f(x)= x-1 has a domain of [0,infinity) and let g(x)= f(f(x)) . The domain of inverse of g(x) is ?

[KevinooBz]

I have a ques .

f(x)= x-1 has a domain of [0,infinity) and let g(x)= f(f(x)) . The domain of inverse of g(x) is ?

dom g(x)= dom f(x)= [0,inf)
dom g^-1(x)=ran g(x)= [-2,inf) is this right?

[Eugenet17]

Probability of Anna,Bianca and Celia passing a Geography test is 0.75,0.5 and 0.6 respectively. The probability that only two girls will pass the next test is?

Edit: nevermind got it

[LOLs99]

dom g(x)= dom f(x)= [0,inf)
dom g^-1(x)=ran g(x)= [-2,inf) is this right?

Yup that's what the heffernan soln said. But since f(f(x)) is a composite function , the range of f(x) must fit into the domain of f(f(x)) which is [0,infinity) -domain of f(x)