# Answers to General Maths Exam (1 Viewer)

#### PC

##### Member
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.

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Worked solutions attached ... finally!

Last edited:

#### beststreet

##### Member
..................... Fuck

#### liger

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

#### sideshowtim

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

#### uhawww

##### Flakes
"(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.

#### patchy20

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

#### michael1

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

#### michael1

##### New Member
have i let the school down??????

#### pupulupk

##### New Member
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?

#### esb

##### New Member
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!

#### michael1

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

#### Datto120

##### Member
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!

#### Dr_Doom

##### Active Member
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?)

#### Dr_Doom

##### Active Member
uhawww said:
"(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

#### teels

##### New Member
question 23 (b) (iii) said months?

#### teels

##### New Member
lol josh you beat me should have known, you always do ^_^

#### raiders771

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

#### katy-g

##### Member
this exam can go and suck a fat one.

#### katy-g

##### Member
Dr_Doom said:
Section II
Question 23
(iii) August (wouldn't this be May, June, July, August, September)
yeh, i did that too....

#### beststreet

##### Member
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.........