post maths standard 2 - questions (1 Viewer)

[danielchen]

HOLY SHIT I LOVE NESA, I LOVE EVERYONE WHO WROTE THAT STANDARD 2 PAPER

On a side note does anyone know for the last Q regarding koalas and their z score - if we were suppose to round up or down?
I had a probability of like 36.6 or 7 (I forgot) and I rounded up, but math teacher said you had to round down?

 

[tripin]

Same, found it quite easy. With exception for a few questions, I felt it could have been the standard 1 paper!

 

[Awesome8r]

wasnt the question asking how many koalas out of 400 would be expected to have a weight of less than 1114kg? Didnt you just times the probabilty of the z score by 400 to get ~383.2 (dont remember exact value) and round? down?

 

[WeiWeiMan]

I rounded down, all my friends rounded up.

If you’re talking about overweight pandas with normal distribution mean 10.4 sd 1.15 and weight 11.93, I rounded up (the question was on advanced idk if it’s common)

 

[jesusandpals]

that was a great paper although idk what the upper and lower bound multiple choice question was

 

[tywebb]

Here is the paper if you want to look at it before it goes on the nesa website

 

[Awesome8r]

Here is the paper if you want to look at it before it goes on the nesa website

how do you have it?

 

[standardfailure]

2021 hsc paper didn't round at all, I put unrounded and rounded up below that circled.

Surely I'm right, if so state rank

 

[Awesome8r]

2021 hsc paper didn't round at all, I put unrounded and rounded up below that circled.

Surely I'm right, if so state rank

i put unrounded and rounded as well. my teacher said if they didnt specify they will mark it right as long as you provided the actual answer.

 

[Awesome8r]

2021 hsc paper didn't round at all, I put unrounded and rounded up below that circled.

Surely I'm right, if so state rank

was the amswer 386?

 

[standardfailure]

386.72
-----------
|387|
---‐--------

That's what I put

 

[Awesome8r]

im so dumb i used the probability for 1.32

 

[tripin]

How did you get 386/387? The z-score was approx 1.3261 so wouldn't it be like 37 or 38

how could it be 386 if there are 400 koaalas and z-score of over 1

 

[Awesome8r]

how did you get 37/38?

 

[jesusandpals]

how did you get 37/38?

the z table said that the probability was for scores below z, and the question asked how many koalas or whatever were over that weight. so you would need to do 1-probability in the table then multiply by 400 to get how many were over that specific weight

 

[Awesome8r]

yeah fuck me why did i open that exam. i also got the circle perimeter question wrong. fuck im not gonna do good

 

[jesusandpals]

yeah fuck me why did i open that exam. i also got the circle perimeter question wrong. fuck im not gonna do good

i think i fucked up the same question cause i messed up the arc formula which is on the formula sheet

 

[Awesome8r]

i think i fucked up the same question cause i messed up the arc formula which is on the formula sheet

same like what the fuck

 

[jesusandpals]

same like what the fuck

its ok we will live

 

[Awesome8r]

not if i dont get the atar i need