Solutions (1 Viewer)

[timbk2]

Post your answers here.

 

[rachey_poo]

ok people....i really sucked at binomial probability before the exam, so when it was almost half of q6 i flipped....except that it was nice of them to put in a show question for (i)....cause i got that!! YAY
question:.....for 18points in (ii) was it 0.7901^18?
and for (iii) could you do 1 - 18C17*(0.7901)^17*(1-0.7901) - (0.7901)^18

where 18C17 is nCr thingy????
i fully made it up? but it sorta sounds right? Right??

 

[LostAuzzie]

I think thats what I did, got something around 0.05 or 0.08 I think for that last one

 

[renya]

yep i did that too

 

[rachey_poo]

stupey question.....how did people find the length of the shortest chord that passes through E in question 3dii) ???
and....does anyone remember their answers for the projectile motion question in 6b) ???

 

[vaniLLa_554]

yea thas wat i did

what did uz get for question 3, (d)(ii) ?

 

[serge]

stupey question.....how did people find the length of the shortest chord that passes through E in question 3dii) ???
and....does anyone remember their answers for the projectile motion question in 6b) ???

You find the minium of the quadratic they give you in 3di

6b) i got something near 40 secs, not sure

 

[renya]

to find the length of the shortest chord i said x had to be a minimum, and solved the derivative of the equation above (part i) to zero.
dont know if thats right or not but it seemed to make sense at the time, cos it followed on

 

[rachey_poo]

really?!?!?! near 40??? maybe i did something right?!?!
lol
i think i got roughly for (ii) between 40 and 56 or something, and then got 49 or so for (iii)....but as i said, just really made it up!
thanks for 3dii).....now i know...lol stupey

 

[serge]

what did people get for the size of the radius? in the Q7 oilslick problem

 

[vaniLLa_554]

You find the minium of the quadratic they give you in 3di

6b) i got something near 40 secs, not sure

im not sure if im right, but i made the discriminant of the quadratic equal zero, so l^2-48=0 so l = 6.9

 

[LostAuzzie]

what did people get for the size of the radius? in the Q7 oilslick problem

From memory I got something like 0.1

 

[renya]

yep, 0.1km

 

[rachey_poo]

think i would have got 0.1 ish (did some recalculations just now)....if i hadnt used 450 and 2....instead should have used 0.450 and 2.....stupey....need to read question a bit more...grrr lol

 

[redw0lf]

Yeh the radius was 0.1km or 100m
How was 7 b) ii) and iii) done?
I assumed that ii) and iii) true and continued with iv) and v)

 

[serge]

yep, 0.1km

cool, same here

 

[fantasy27]

yay, i also 0.1km for the radius, i had to do it twice because i wasn't sure

for that smallest chord, i also got L^2=48, so i got 6.9, i done it in the last few minutes when i was going back over the paper

 

[Swalbs]

Instead of agreeing that its 0.1, do you think one of you could post HOW you got the answer?

 

[holla back girl]

Instead of agreeing that its 0.1, do you think one of you could post HOW you got the answer?

find PT using pythagoras theorm. ie PT^2 =450^2 + 2000^2

tan @/2 = r /PT


where @ is the angle
i did my calculations in metres, so i got an anwer of 102.6m
hope it helps!

 

[Cloak]

my estimated uai is about 42- argh i am so badly not going to be able to play golf this saturday oh well just sunday isn;t that bad