VCE General & Further Maths Question Thread!

[Einstein]

@Stick, dude im retarted. I didnt even read the question right haha that it asked for r^2, read it as it asked for, r, wow haha. Thanks for clarifying ahhahah! This is embarrassing

[darklight]

Hi guys, VCAA 2007 q2 graphs and relations, shouldn't the graph have an open circle at s=0?

[Professor Polonsky]

Technically yes, but it seems like they marked both as correct (probably so to not trip so many people up with it).

[darklight]

Hey, for 2008 VCAA q3, graphs and relations when they say between 80 and 150, does that mean inclusive of 80/150. I think it should work if 80 and 150 were included but the word "between" seems to imply otherwise.

[PsychoT]

What does it mean by a "unique solution" in Matricies? Only thing stumping me for my SAC tomorrow.

[Zealous]

All the questions recently have been about modules I didn't do.. sigh o.o

[PsychoT]

All the questions recently have been about modules I didn't do.. sigh o.o

What modules did you do?

[Einstein]

can someone help me on this one, i have entered them in list 1 and 2 respectively and done lin reg, but my equation is different to that of the back of book. Can someone outline the steps

[byCrypt]

can someone help me on this one, i have entered them in list 1 and 2 respectively and done lin reg, but my equation is different to that of the back of book. Can someone outline the steps

x is the independent variable and y is the dependent. After entering the 2 lists, then make sure you put x on the x-axis and y on the y-axis. I got D. y=7.5+0.5x

[Einstein]

thats exactly what i did, exept putting x on x-axis and y  on the y. I'm not sure how to do that, is it already set that way? I have casioclasspad 330

[MagicGecko]

thats exactly what i did, exept putting x on x-axis and y  on the y. I'm not sure how to do that, is it already set that way? I have casioclasspad 330

I don't know how to use the classpad, but I found these instructions in the textbook on how to calculate the regression line using the casio  classpad. I added in that question because the instruction relate to it, use this as somewhat of a template for answering your question

[Anchy]

Hey, I've attached a question below and was wondering why the answer is E (1588)

Thanks.

[MagicGecko]

Hey, I've attached a question below and was wondering why the answer is E (1588)

Thanks.

The seasonal index for Quarter 3 is actually 1.6 
4-(0.65+1.1+0.65) = 1.6
Now you just divide the sales value by the SI ---> 2540/1.6 = 1587.5 = 1588

arrggg those silly mistakes right! 

[Anchy]

The seasonal index for Quarter 3 is actually 1.6 
4-(0.65+1.1+0.65) = 1.6
Now you just divide the sales value by the SI ---> 2540/1.6 = 1587.5 = 1588

arrggg those silly mistakes right! 

Haha yeah, frustrating! Thanks for that.

I've got another question.

Average no. of children per family in Denmark = 1.4
Standard deviation for the number of children per family in Denmark = 0.3

Assuming the data is normally distributed, what percentage have less than two children?

I've got my answer as 97.5%, however the answer says its 98.5%. Is that a typo or am i looking at it wrong?

[MagicGecko]

Haha yeah, frustrating! Thanks for that.

I've got another question.

Average no. of children per family in Denmark = 1.4
Standard deviation per family in Denmark is 0.3

Assuming the data is normally distributed, what percentage have less than two children?

I've got my answer as 97.5%, however the answer says its 98.5%. Is that a typo or am i looking at it wrong?

I got 97.5% as well, pretty sure that's a typo, even if the SD was moved one more to the right, it would not equal 98.5%, but hey the 7 and 8 are pretty close to each other on the keyboard
I'd say you are doing it right.