exam 2 thoughts + answers, applying sticky

[joechan521]

CORE Q1) a) bell shape with trail to the right, positive skewed
bi) 26 ii) 19.4%
Q2a) 1964
bi)13.77 ii)-0.09 iii) 0.013
Q3bi) y=60.3x-776.9
c)randomly scattered above and below the axis
d)83%
e] strong positive linear

GEOMETRY
Q1a)12cm
b)20.6
c)41.1
d)1/2
Q2b) 3344
Q3a)7168
c)420
Q4a)3/4
b)37/64

GRAPH
Q1a) 30
b)190
c)95
Q2a)10.8
c) ave.speed>75km/h
d)$7.92
Q3a)the number of hours driving =<24h
c)yes as x=10y=5
d)max 18 min17


MATRICES
Q1a)
[160
280
180
80  ]
bi) 1890
ii) 4x4
iii) total energy
c) b=4 m=4 p=2 h=1
Q2 a) 700
b)0.5
ci)
[160
280
180
80]
ii) 280
iii)56
iv)7
v)
[0
0
0
700]
di)
[190
280
180
80]

ii) 130

[dashkenny]

YES, first haha!

i thought it was a lot easier then exam 1 T_T

i'll umm type my answers out after lunch, kinda cbf right now:)

good luck boys and girls

[reg]

fkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk

core, relations, business was all good, but i panicked in geometry and lost at least 7 marks ................. ran out of time too

[Nick]

How do you guys know your answers?

We didn't get to keep the paper?

[joechan521]

How do you guys know your answers?

We didn't get to keep the paper?

wrote in formulae sheet

[hifer]

haha.. ur fast joe

anyways, did everyone get 130 for the last question in Matrices?

And did everyone write bell-shaped for the first questions in Core? I only wrote positively skewed.. ><

[hifer]

My answers are pretty much the same as joe for the other modules, so i'll post up my answers for
Business Math:

1ai) 1750
ii) 218.75
bi) 8420
ii) 7.3%
c) 5950
2a) 225
b) 16801
c) 622.75
3a) 818.18
bi) 120
ii) 325
4a) 5277
b) 16.7

[reg]

d)max 18 min17

don't max/min have to occur at the vertices of the boundary? they existed only at x=16, x=18, but not at 17 la.

[SilverBullet]

i thought i went alright considering I didn't study and thought i was going to fail!

[hifer]

d)max 18 min17

don't max/min have to occur at the vertices of the boundary? they existed only at x=16, x=18, but not at 17 la.

Min is not 16, coz they need to travel for 24 hours, and they only have 7 hours of petrol, thus, 24-16 = 8 hours of petrol needed which is not possible.

They effectively introduced 2 more constraints to the problem, x <= 20 and y<= 7

[AhaShake]

all the same from what i can tell/remember.
it was a little harder than i expected to be honest.

[Mystery]

Can someone help me out with matrices last question, I mucked it up... hopefully someone will have it still in their calculators(the values) and can help explain it...

Also, for GRAPHS & RELATIONS, Question 2.d) Are you 100% sure its $7.92?, I got $10.64

[hifer]

Can someone help me out with matrices last question, I mucked it up... hopefully someone will have it still in their calculators(the values) and can help explain it...

Also, for GRAPHS & RELATIONS, Question 2.d) Are you 100% sure its $7.92?, I got $10.64

Hey do u rmb what u got for the last Qs? I still have the matrices in my calc but somehow i can't get the answer i got before lol.. and I got the same answer as Joe for 2d

[Nick]

For graphs I got $8...not 7.92..will I get half a mark?

[Mystery]

Can someone help me out with matrices last question, I mucked it up... hopefully someone will have it still in their calculators(the values) and can help explain it...

Also, for GRAPHS & RELATIONS, Question 2.d) Are you 100% sure its $7.92?, I got $10.64

Hey do u rmb what u got for the last Qs? I still have the matrices in my calc but somehow i can't get the answer i got before lol.. and I got the same answer as Joe for 2d

I got something different, like 92 eggs.... but I'm assuming its wrong because people were telling me somethin like 1xx

damn that graphs and relations, what was it asking again question 2.d) they gave you average speed of 80km/h and you had to sub it into the equation and you would get the amount of gas, from which you times that amount of gas by 80 cents?