Mathematical Methods CAS Exam 1 Discussion - How was it??

[sophie.tran999]

f my life i misssread teh question. BD = 2CD instead of BC = 2CD. things got frekin idot, stupid !!!!

[Milkshake]

Can anyone remember the values given for question 8 about the Pr(A' intersect B) question?

Can't figure out why my answer was wrong :S

[luken93]

Can anyone remember the values given for question 8 about the Pr(A' intersect B) question?

Can't figure out why my answer was wrong :S

Pr(A) = 3/5, Pr(B) = 1/4 was it?

[Milkshake]

Can anyone remember the values given for question 8 about the Pr(A' intersect B) question?

Can't figure out why my answer was wrong :S

Pr(A) = 3/5, Pr(B) = 1/4 was it?

And then what was given for Pr(A union B) for part A?

[acinod]

Would I get at least one mark for mentioning (-infinite,-8] intersection [-2,infinite) n.b it should be union not intersection and the question was worth 2 marks.

+1. You'll probably get one mark.

On another note, would I get one mark for writing (-infinite,-8)U(-2, infinite)? Basically I forgot to include -8 and -2 in the domain.

[mattshen]

FUARK THAT DOMAIN QUESTION T-T
SO TRICKY :/
hey guys where do you reckon the 2 marks would be allocated? I thought the function was a circle and hence my domain was wrong LOL. Do you think they'd give one mark for stating 'rang is a subset of domf'? Cheers

[extcar]

Can anyone remember the values given for question 8 about the Pr(A' intersect B) question?

Can't figure out why my answer was wrong :S

Pr(A) = 3/5, Pr(B) = 1/4 was it?

And then what was given for Pr(A union B) for part A?

3/4 i think

[sophie.tran999]

Can anyone remember the values given for question 8 about the Pr(A' intersect B) question?

Can't figure out why my answer was wrong :S

Pr(A) = 3/5, Pr(B) = 1/4 was it?

And then what was given for Pr(A union B) for part A?

a) Pr (A n B) = Pr (A) + Pr (B) - Pr (A u B) = 3/5 + 1/4 - 3/4, then Pr (A' n B) = Pr (B) - Pr (A n B) = 3/20.
b) Pr( A'nB) = Pr (B) - Pr (A n B)  = Pr(B) = 1/4 (as Pr(A n B)=0, A, B are mutually ex...)

[ashyy05]

for the probability question
if you started the equation by saying Integral from 3.5 - 2 blah blah blah
but throughout all your working out you stupidly worked out 3.5 - 0
would i get any marks



ovasly both my answers were wrong as for
a) i got 3/8
b) 1 ovasly wrong haha

would i get anymarks?

I got the same answers as you did. Im pretty sure consequential marks will be allocated

Lol i got that too!! Completely forgot that you have to seperate the modulus into two equations!!!!!

[mickeymouse]

so many goddamn fractions to work out
hate them, and the fact that I integrated the probability density function
what a nightmare today

[dking123]

how about when you anti diff 1/something do you need modulus?

[meli001]

LOL. Anyone hammering down on Kilbaha Exam 2 tonight?

[mickeymouse]

how about when you anti diff 1/something do you need modulus?

no you dont

you diff the negative f(x) from 3.5 to 3
diff the positive function from 3-2

add together, if you draw it out it intersects at 3

if i remember correctly.... spent so long on it all can i remember is this one

[BoredSatan]

so many goddamn fractions to work out
hate them, and the fact that I integrated the probability density function
what a nightmare today

lol I did fractions too.
but the easiest way was to use symmetry and triangles..
still got the answers though.

[vgardiy]

how about when you anti diff 1/something do you need modulus?

no you dont

you diff the negative f(x) from 3.5 to 3
diff the positive function from 3-2

add together, if you draw it out it intersects at 3

if i remember correctly.... spent so long on it all can i remember is this one

He's talking about the 1/(3x+4) Question.
You did need modulus.

Also, if i wrote ln|x+4/3| /3 will i still get the marks for the antidiff question?