VCE Further Maths Exam 1 Discussion and Solutions

[Something2016]

Hey,

I am ranked 1st with a 100% SAC Average,
I scored 39/40 in Exam 1.
How many marks can I lose in Exam 2 and still pull off a 50?

[mtDNA]

Hey,

I am ranked 1st with a 100% SAC Average,
I scored 39/40 in Exam 1.
How many marks can I lose in Exam 2 and still pull off a 50?

Bump

[Something2016]

Bump

??

[Somedudelmaoy]

Hey,

I am ranked 1st with a 100% SAC Average,
I scored 39/40 in Exam 1.
How many marks can I lose in Exam 2 and still pull off a 50?

none.

[jonwil]

none.

Gotta take into account that this years exam was much harder than last years therein the cut offs will be less
Im rank 1, 100% sac average with 38/40
And people still reckon if I ace mondays exam or drop 1 mark a 50 is still possible

[jimbo9]

Question 13 of core, after placing the values of the time series into the calculator and producing the least squares regression line there is a positive gradient that suggests an increasing trend. It's not the largest gradient but the definition of an increasing trend is merely an increase over the long term which is clear here. Is this not true?

Doing this also gives an r of less than 0.25 which means no relationship.
I think it would have to be quite a bit higher to be "best described" as E

 

[Joel1999]

Doing this also gives an r of less than 0.25 which means no relationship.
I think it would have to be quite a bit higher to be "best described" as E

Yeah like I said, it is quite a small slope, but I think the term increasing trend is too subjective. As in what actually qualifies something to have an 'increasing trend' because my definition is what I stated earlier which is very vague....

[helpmepls]

Hi, I'm really unhappy with how I went. Are the answers posted on here DEFINATELY all correct. If I got 23/40 - any clue what this would be putting my study score at approx. and what I'd need to get in the 2nd exam to get over 30? Thanks. 

[Nomi16]

what do you mean by this?

C is the total cost for n pies.
C = 0.8n + 250
C(200) = 0.8 * 200 + 250
C(200) = 410

He sells 150 at full price (x) and sells 50 at half price x/2 he wants to break even so cost of production = total cost sold for
410 = 150x + (50 *x)/2
410 = 150x + 25x
410 = 175x
x = 410/175
x = 2.34
so closest answer is $2.35 i.e. C

I meant that full price is only for the first 150 pieces thus the cost of the 150 pieces comes out to be 370.
so 370/150=2.466 which is the break even point of the 150 pieces. So the answer should be D.

[KidClutch]

Yeah like I said, it is quite a small slope, but I think the term increasing trend is too subjective. As in what actually qualifies something to have an 'increasing trend' because my definition is what I stated earlier which is very vague....

He's not talking about the slope, but rather the correlation coefficient is 0.25, which considered no correlation
To find the underlying trend, you should use smoothing rather than a linear regression line

[KidClutch]

I meant that full price is only for the first 150 pieces thus the cost of the 150 pieces comes out to be 370.
so 370/150=2.466 which is the break even point of the 150 pieces. So the answer should be D.

The half-price pies still have the same costs as the full price pies, which is 410, since she has already made 200 pies

[elle6299]

Hey, I was just wondering if with working out bearings, is it always in a clockwise direction and never anticlockwise?
Thanks in advance!

[Joel1999]

He's not talking about the slope, but rather the correlation coefficient is 0.25, which considered no correlation
To find the underlying trend, you should use smoothing rather than a linear regression line

I know that, the slope is dependant on the correlation coefficient. But that is irrelevant, if you can tell me why precisely what qualifies a time series to have an increasing or decreasing trend. Because no where in the definition does it refer to the smoothed time series of any kind. Because to me if something is "increasing" over the period of time given it follows that it has an "increasing trend".

[Spencer_Luscombe]

Are significant figures different to decimal places? eg. would the number 1.2345 to three significant figures be 1.235 or 1.23

[KidClutch]

I know that, the slope is dependant on the correlation coefficient. But that is irrelevant, if you can tell me why precisely what qualifies a time series to have an increasing or decreasing trend. Because no where in the definition does it refer to the smoothed time series of any kind. Because to me if something is "increasing" over the period of time given it follows that it has an "increasing trend".

The fluctuations are obscuring the underlying pattern in the time series, therefore smoothing is required