**Ordinary Level Maths Paper 2...Before/After**

An0n

subz3r0 wrote: »

To draw the centroid the graphical way you:
1. bisect each line to get a midpoint of each line. Hope you know how to do that.
2. You join the every midpoint to the opposite angle of that midpoint.
3. Where they intersect is the midpoint.

Where they intersect is the centroid.* Or the center of gravity for that triangle.

Bears and Vodka

An0n wrote: »

Where they intersect is the centroid.* Or the center of gravity for that triangle.

Sorry yeah, my bad. If any of ye were in HL Maths then you might have done the experiment where you cut out a triangle from cardboard, find its centroid and balance it on your pen tip or something like that.

Bears and Vodka

How do you input this into the calculator to calculate the standard deviation? I know how to do normal sets but not these with frequencies. I have Sharp EL-W531.
Or how would you go about doing it at all?

P.S. Answer is 9.8488

EDIT: I got it. You just have to put in all 100 numbers yourself manually. Takes a while and you gotta be careful.

An0n

subz3r0 wrote: »

How do you input this into the calculator to calculate the standard deviation? I know how to do normal sets but not these with frequencies. I have Sharp EL-W531.
Or how would you go about doing it at all?

P.S. Answer is 9.8488

EDIT: I got it. You just have to put in all 100 numbers yourself manually. Takes a while and you gotta be careful.

There's a way to do that on a Sharp without having to put in all the values.
Idk how but you can place the mean, the x values and f values and it would just do it all for you. I have yet to figure it out xD

Darren.993

I got 35 for the mean and 9.8488 for the standard deviation.

There's actually a really easy way to do it on Casio calculators too.

Mysteriouschic

Will the 5A be a definition we need to know with a choice between 5B being s theorem or construction.
All of the sample papers are quite different that I'm not sure what I actually need to know :S. The circle questions, slope, area and volume.
I'm fairly okay with those and some of the statistic things . I probably need to look in my book to remember how to do probability I remember some of them.

Mani09

This paper 2 is fu**king stupid... They give us sample papers and don't give us the sample answers. YOU CAN'T MAKE MATHS FUN.

PictureFrame

Darren.993 wrote: »

I got 35 for the mean and 9.8488 for the standard deviation.

There's actually a really easy way to do it on Casio calculators too.

Can anyone tell me how to do it on a Casio? I have a vague idea but nothing too solid like!

Schonie

PictureFrame wrote: »

Can anyone tell me how to do it on a Casio? I have a vague idea but nothing too solid like!

I'd also like to know how to do it but on the Sharp calculator please?:) Thanks in advance...:D

Hoggy1000

For anyone looking for how to do the constructions

http://www.mathopenref.com/tocs/constructionstoc.html

bazinga_

does anyone know where to find a marking scheme for the 2011 sample please?

leavings

ashalingable wrote: »

Can anyone tell me "what's the fundamental principle of counting" ???

this is what i have...

''if an operation has X possible outcomes and a second operation has a Y number of outcomes the total numer of possible outcomes is (X)(Y)...

biohaiid

Can anyone tell me what constructions we need to know for this year?
Is it just circumcirlcle, incircle and enlargements?
There's more in the book but I dont know if they're for next year or not.

I thought I'd be fine for this paper but revising now and I cant do a thing.
I can never get the theorem questions and haven't looked at statistics and probability yet

Mayo_Boy

biohaiid wrote: »

Can anyone tell me what constructions we need to know for this year?
Is it just circumcirlcle, incircle and enlargements?
There's more in the book but I dont know if they're for next year or not.

I thought I'd be fine for this paper but revising now and I cant do a thing.
I can never get the theorem questions and haven't looked at statistics and probability yet

Exact same position as your in ,and I messed up paper 1 which means I really have to do good in this tomorrow

bazinga_

leavings wrote: »

this is what i have...

''if an operation has X possible outcomes and a second operation has a Y number of outcomes the total numer of possible outcomes is (X)(Y)...

i think it basically means if one event AND another will happen, you multiply the probabilities (also called the AND rule)

and btw the OR rule means if one OR another event will happen, you add the probabilities.

at least that's how i've always learnt it!

Mysteriouschic

Trigonometry is so frustrating :rolleyes:.
I can do half of it but some of them I haven't got a clue how to do.
I really hope I don't forget how to do them.
Some shapes they give you are really complicated.

Mayo_Boy

Let me get this straight. Do we actually need to know theorems, and if so which ones?

Mani09

Just remember "or" means add, and "and" means multiply in probability :-)

HowAreWe

"the probability that the sun will shine tomorrow is 0.32.Hence the probability that it will rain tomorrow is 0.68"

yes....no.....what.......


seriously what are we meant to say to this? is it really straight forward or is there some specific way of answering these type of questions?

Fergus_

Would we have to prove any theorms in the paper?

Killian In The Name Of

Seriously dreading this tomorrow...

mcpaddington

Fergus_ wrote: »

Would we have to prove any theorms in the paper?

Yes in Q6.

Fergus_

mcpaddington wrote: »

Yes in Q6.

Q5 A/B you mean?

ashalingable

"perform a ""Tukey Quick Test"" on the data".....what? :S

Mayo_Boy

ashalingable wrote: »

"perform a ""Tukey Quick Test"" on the data".....what? :S

Yeah what the f*ck is that supposed to mean? SEC really would want to take a cup of cop the fúck on :mad:

Mysteriouschic

ashalingable wrote: »

"perform a ""Tukey Quick Test"" on the data".....what? :S

Thats not on the course this year it was on last years or so my teacher says.

Cruel Sun

Don't really know what to expect tomorrow, we only got one proper sample paper with no answers!

Not good enough SEC.....Not good enough.

hotfuzz2

ashalingable wrote: »

"perform a ""Tukey Quick Test"" on the data".....what? :S

It's off the course now.
Ugh there's too much to doooo. And I have to re-learn about 5 Irish essays. Hmph.

ashalingable

Martin_94 wrote: »

Don't really know what to expect tomorrow, we only got one proper sample paper with no answers!

Not good enough SEC.....Not good enough.

Too True.

Mysteriouschic

I'm really getting stressed over this maths thing.
I can't do all of the trigonometry! and I need near enough 80-100 to pass with a good grade. I don't know all the definitions that we need to know either .