Silly Questions Thread

[Whatlol]

Pr (X > 170) = Pr ( Z > -0.5 ) = 1- PR (Z>0.5) = 0.7

Thats because Pr(Z < -1/2 ) = Pr(Z > 1/2)

Pr(X>180| X >175) = Pr(Z>0.5) / 0.5  = 0.3/0.5 = 3/10 x 2 = 3/5

Shouldn't Pr(Z > 0.5) correlate to the mean, since it's the middle number? How do you know that 170 is the middle number, when it says the mean is 175? or do you just make that assumption when the question asks that?

Pr(Z>0.5) indicates  0.5 standard deviations away from the mean. Pr(Z>0) indicates you are at the mean and the probability will be 0.5

[itolduso]

if one is greater than two, is two smaller than one?

[Whatlol]

if one is greater than two, is two smaller than one?

what? one is less than two lol

[lachymm]

I got a couple silly questions and they are from the same exam as that probability question previously asked...

How is the same as its probably simple but i dont see it?

And how do you solve

Sorry about my latex skills...

[7132]

this is correct: 4/x

dilate the graph X 4 away from the x-axis?

[m@tty]

I got a couple silly questions and they are from the same exam as that probability question previously asked...

How is the same as its probably simple but i dont see it?

And how do you solve

Sorry about my latex skills...

Assuming







(first two solutions only)

[lachymm]

Hmmm, i always forget the rules for tan(x) and manipulating it into

Are there any other rules for manipulating Tan(x) ?

Also thanks M@tty for the help, you are shooting for a big score in methods

[lachymm]

Oh yeah i ment how is equal to

I seem to be having trouble manipulating simple indices and stuff

If someone could give me a hand it would be appreciated

[m@tty]

It's a general indices rule:



Other rules of importance are





That's all you need to know, I think.

And I already did Methods last year.

[lachymm]

Oh so you have..i just read your sig but skipped over the year, haha

Chears for the help you going to be on here for much longer, im going through practice exams i did a few weeks ago and seeing if i dont understand some stuff, if you are just chilling i might have some questions for ya   

[m@tty]

Someone will be able to answer your questions, post them up. =)

[lachymm]

alrighty, Well i got a couple "silly questions"

1st one isnt really related but anyways..
As someone who has already done methods -In the exam what is the best way to use your reading time in the exams and also do you think its better to leave the multiple choice in exam 2 for last?

[lachymm]

I got a quick question, what do you guys do when you come upto a question similar to "which one of the following satisfies the functional eqution ? They take me for ages and i have now begun skipping them as they waste my time. However i usually do trial and error, i get them right its just they are so time consuming...Any tips for doing them quickly?

[m@tty]

As I already posted for Spesh:

Thoroughly read the extended answer, get an idea of where they are going, what you need to do and any specific requirements of questions such as 2dp, certain forms, integers, etc. Also look out for any tricks embedded in questions, if you can get a thorough understanding of these things during reading time, I find you all but eliminate stupid errors.

I actually would discourage you from dong MC in reading time, as many are complex and you want to employ your calculator to its fullest extent, as there is no working required. Certainly, though, have a quick read of the multiple choice questions in reading time if you have a chance after scrutinising section 2.


Personally with Methods I just did MC then the short answer, but that was because I had no problem with time. If you are worried about not finishing then you should do section 2 first and then the MC. If you run out of time you can guess all of the MC, but you can make almost no progress in a minute with short answer. In addition, there are 58 marks in section two, compared to only 22 in section 1.

[m@tty]

I got a quick question, what do you guys do when you come upto a question similar to "which one of the following satisfies the functional eqution ? They take me for ages and i have now begun skipping them as they waste my time. However i usually do trial and error, i get them right its just they are so time consuming...Any tips for doing them quickly?

Can you provide an example?

I'd say, and this should not be taken as truth as this was not in non-CAS, that you should just work through the alternatives, starting with the one that looks most likely to save time, assuming it's a MC.