1. ## Answers to General Maths Exam

Hi everyone,

These are just the answers. I'll to post worked solutions later. Sorry for the delay. There's now a rule which says that teachers can get the papers 2 hours after starting. Last year it was 30 minutes.

Anyway ... for the record ...

Section I
1. A
2. D
3. B
4. C
5. B
6. B
7. D
8. C
9. C
10. C
11. A
12. B
13. D
14. A
15. A
16. C
17. D
18. D
19. B
20. C
21. B
22. B

Section II
Question 23
(a) 4ab/3
(b) (i) 19*C
(ii) February
(iii) May, June, July, August, September
(c) (i) Systematic sample, something like every 5th student in order on the roll. Can also be a straight random sample, like names out of a hat. Can also be a stratified sample based on number of students in each year group, then a systematic or random sample from each year group.
(ii) Mean is 7.275 hours per week (using class centres). Mean class is 5-9 hours per week.
(d) (i) \$6
(ii) 4 kg or 7 kg
(iii) Weights more that 4 kg, up to and including 6 kg, and weights more than 7 kg.
(iv) \$1.50 per kg

Question 24
(a) Vertical axis does not start at 0, pictures change in three dimensions instead of just one.
(b) (i) 70*
(ii) 109 cm
(c) Lovely box plot, Min = 140, Q1 = 145, Median = 150, Q3 = 170, Max = 190
(d) (i) 567 L
(ii) 30 cm

Question 25
(a) (i) 6
(ii) 1/3
(iii) 2/3
(b) (i) 29 days
(ii) \$8.61
(c) (i) 1/60
(ii) 1/5370
(d) Martha's effective interest rate is 6.76% p.a. so she gets the better deal.

Question 26
(a) (i) Lovely diagram
(ii) 53 m
(b) (i) Lovely net - probably best is to have four lots of a triangle on top of a rectangle next to each other across the page.
(ii) 252 m2
(c) (i) 98
(ii) 43/100
(iii) 28
(d) 17 h 30 min

Question 27
(a) (i) \$130 000 over 30 years
(ii) \$45964.80
(b) (i) y-intercept exists when height = 0 cm, but this will never occur. No person ever has a height of 0 cm.
(ii) George's feet should be 3 cm longer than Harry's
(iii) For this data, correlation coefficient should be positive rather than negative. Correlation coefficients only range from -1 to 1 so r = -1.2 is not possible.
(c) (i) \$24000
(ii) \$7593.75
(iii) Graph - Straight line from \$30000 to \$24000 after 3 years, then curve down to \$7593.75 after 7 years

Question 28
(a) (i) 4 combinations: 1 x \$2, 1 x 50c; 2 x \$1, 1 x 50c; 1 x \$1, 3 x 50c; 5 x 50c
(ii) 6/55
(iii) \$(2x + y + 0.5z)
(b) (i) \$12
(ii) 3500 vehicles, daily income \$17 500
(iii) v = 6000 – 500d, or d = 12 – (v/500)
(iv) Anne's statement is incorrect. Maximum daily income is \$18 000 when the toll is set at \$6 per vehicle.

----------

Worked solutions attached ... finally!

2. ## Re: Answers to General Maths Exam

..................... Fuck

3. ## Re: Answers to General Maths Exam

uh-oh. That means I get 69% (!!!!!!!!!!!!!!!!!!!!!!!!!) I'm ranked 2nd in my year with 90%!!!!!!! thank goodness I'm doing 12 units

4. ## Re: Answers to General Maths Exam

does anyone have a copy of the paper they could post up? the examiners didn't let us take ours.

5. ## Re: Answers to General Maths Exam

"(b) (i) 28 days"

Shouldn't this be 29? If not, whoo I got it right! But I only got 28 in the exam because I thought there were 30 days in May, but there are 31. It also says interest is charged on the day of transaction, which is now giving me 29.

6. ## Re: Answers to General Maths Exam

i totally fucked that up! god i hope my rank saves me. 9/45 is my rank. F\$%^\$&\$&#W^#^

7. ## Re: Answers to General Maths Exam

so i got 68% and ranked 1st what does this mean now?

8. ## Re: Answers to General Maths Exam

have i let the school down??????

9. ## Re: Answers to General Maths Exam

im sure you didn't let your school down, be positive

If you get a result of say 70 or something for this exam, does that become your HSC mark, or does it still get influence by how the state does and how your class does?

10. ## Re: Answers to General Maths Exam

Damn, my class mark was in the 80's and i came third in my class. I got around 67% in the test.... I actually thought that was an easy exam....:mad1:

On a lighter note...
Happy Halloween Everyone!

11. ## Re: Answers to General Maths Exam

so can my mark get pushed up coz im no.1? and getting about 70%?

12. ## Re: Answers to General Maths Exam

HOLY SHIT :mad1: I did worse then i thought! :burn: there goes a uai of 78 looks like tafe for me next year!!!!!!!!!

Please tell me your not a teacher and they are not correct!

13. ## Re: Answers to General Maths Exam

Section II
Question 23
(a) 4ab/3
(b) (i) 19*C
(ii) February
(iii) August (wouldn't this be May, June, July, August, September)
(c) (i) Systematic sample, something like every 5th student in order on the roll. (would a simple random sample be correct?)

14. ## Re: Answers to General Maths Exam

Originally Posted by uhawww
"(b) (i) 28 days"

Shouldn't this be 29? If not, whoo I got it right! But I only got 28 in the exam because I thought there were 30 days in May, but there are 31. It also says interest is charged on the day of transaction, which is now giving me 29.
Yeah I put 29

15. ## Re: Answers to General Maths Exam

question 23 (b) (iii) said months?

16. ## Re: Answers to General Maths Exam

lol josh you beat me :P should have known, you always do ^_^

17. ## Re: Answers to General Maths Exam

woooo 96% at least depending on some answers what they accept

18. ## Re: Answers to General Maths Exam

this exam can go and suck a fat one.

19. ## Re: Answers to General Maths Exam

Originally Posted by Dr_Doom
Section II
Question 23
(iii) August (wouldn't this be May, June, July, August, September)
yeh, i did that too....

20. ## Re: Answers to General Maths Exam

yea i got 29 days to you clown...and i swear to god that martha pwned that dude with her investments....we'll see 19th dec. , we'll see.........

21. ## Re: Answers to General Maths Exam

this paper was hard man!!! compared 2 last years 1, it was 50556321+6789 times harder....
does anyone agree?

also, all the exams i have done up 2 date have been much harder than that of last year!!!

anyone agree? im starting 2 get worried...
but does this mean that regardless of marks, theyd scale us according 2 the state? like obviously many ppl didnt go good, so does it mean, the higher our marks (standard dev), the more we'd get scaled???

anyone know?

22. ## Re: Answers to General Maths Exam

lol whooooohoo, im not the only one that stuffed up! shit it was bloody hard, last yeears paper was a walk in the park! but i guess if every1 stuffed up theyll rank us up??well i hope! i ended up first n i think i got around 70 in this exam!
btw didmartha have a better investment?i was pritty confident with that?but i guess u guys are smarter?
peace out!!!!

23. ## Re: Answers to General Maths Exam

holy shit....
i'm fuck up..

24. ## Re: Answers to General Maths Exam

like no offence, but ther r so many incorrect answers there... ur just demotivating people 4 no reason... btw, i hav d whole exam paper sitting infront of me... n i re-did it all

Originally Posted by PC
Hi everyone,

These are just the answers. I'll to post worked solutions later. Sorry for the delay. There's now a rule which says that teachers can get the papers 2 hours after starting. Last year it was 30 minutes.

Anyway ... for the record ...

Section I
1. A
2. D
3. B
4. C
5. B
6. B
7. D
8. C
9. C
10. C
11. A
12. B
13. D
14. A
15. A
16. C
17. D
18. D
19. B
20. C
21. B
22. B

Section II
Question 23
(a) 4ab/3 i dont noe bout this one, but rnt we meant 2 make the denominators the same, which will give = 3a6^3/3bw X 4w^2/3bw = 12ab^3w^2 ??? because denominator cancels out since theyr the same...

(b) (i) 19*C
(ii) February
(iii) August its asking in monthS = so its from may to september
(c) (i) Systematic sample, something like every 5th student in order on the roll. it can also b stratified
(ii) Mean is 7.275 hours per week (using class centres). Mean class is 5-9 hours per week.
(d) (i) \$6
(ii) 4 kg or 7 kg
(iii) Weights more that 4 kg, up to and including 6 kg, and weights more than 7 kg.
(iv) \$1.50 per kg

Question 24
(a) Vertical axis does not start at 0, pictures change in three dimensions instead of just one. also, scale of boxes are inacccurate = creates bias
(b) (i) 71* its 70*
(ii) 109 cm
(c) Lovely box plot, Min = 140, Q1 = 145, Median = 150, Q3 = 170, Max = 190
(d) (i) 567 L
(ii) 30 cm this isnt correct. d answer is 15cm... y did u X2? the trough is only d cm long... thats it

Question 25
(a) (i) 6
(ii) 1/3
(iii) 2/3
(b) (i) 28 days
(ii) \$8.61
(c) (i) 1/60
(ii) 1/5370
(d) Martha's effective interest rate is 6.36%p.a. so Paul gets the better deal. i actually put them all into an annuity formula (with the same principal) and martha's one was higher, and i also double checked...???

Question 26
(a) (i) Lovely diagram
(ii) 53 m
(b) (i) Lovely net - probably best is to have four lots of a triangle on top of a rectangle next to each other across the page.
(ii) 252 m2
(c) (i) 98
(ii) 43/100 ??....its 74/200 = 37/100
(iii) 28
(d) 17 h 30 min

Question 27
(a) (i) \$130 000 over 30 years .. also incorrect... max is \$80 000 over 10 years.
(ii) \$45964.80
(b) (i) y-intercept exists when height = 0 cm, but this will never occur. No person ever has a height of 0 cm.
(ii) George's feet should be 3 cm longer than Harry's
(iii) For this data, correlation coefficient should be positive rather than negative. Correlation coefficients only range from -1 to 1 so r = -1.2 is not possible.
(c) (i) \$24000
(ii) \$7593.75
(iii) Graph - Straight line from \$30000 to \$24000 after 3 years, then curve down to \$7593.75 after 7 years

Question 28
(a) (i) 4 combinations: 1 x \$2, 1 x 50¢; 2 x \$1, 1 x 50¢; 1 x \$1, 3 x 50¢; 5 x 50¢
(ii) 6/55
(iii) \$(2x + y + 0.5z)
(b) (i) \$12
(ii) \$17 500 which is 3500 vehicles
(iii) v = 6000 – 500d
(iv) Anne's statement is incorrect. Maximum daily income is \$18 000 when the toll is set at \$6 per vehicle.

25. ## Re: Answers to General Maths Exam

^ a number of your "corrections" are wrong. I'm not going to point them all out, but I'll point this one out.

"this isnt correct. d answer is 15cm... y did u X2? the trough is only d cm long... thats it"

You need to double it because the area of an ellipse formula only works on a full ellipse. If you used that to get the answer you would have needed to double the area. The result was 30, which was the semi-b axis, semi meaning half which means 30 was the half length (depth of the tub).

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