ATAR Notes: Forum

VCE Stuff => VCE Mathematics => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE General & Further Mathematics => Topic started by: iwannagetA on November 02, 2010, 12:19:25 pm

Title: VCAA 2009 Core Question
Post by: iwannagetA on November 02, 2010, 12:19:25 pm

Help me with question 4 b) from exam 2

http://www.vcaa.vic.edu.au/vcaa/vce/studies/mathematics/further/pastexams/2009/2009furmath2-w.pdf

we use this formula?

deseasonalised = actual/seasonal index

 :-\

Title: Re: VCAA 2009 Core Question
Post by: kenhung123 on November 02, 2010, 12:20:22 pm

Yea, whats wrong with it?

Title: Re: VCAA 2009 Core Question
Post by: iwannagetA on November 02, 2010, 12:20:46 pm

im getting wrong answer

Title: Re: VCAA 2009 Core Question
Post by: iwannagetA on November 02, 2010, 12:21:58 pm

In 2008 a total of 188mm of rain fell during summer << is this the actual??? an the seasonal index i guess is 0.78??

but its still wrong

Title: Re: VCAA 2009 Core Question
Post by: jasoN- on November 02, 2010, 12:22:29 pm

188/.78 = 241.02 = 241 = the answer

Title: Re: VCAA 2009 Core Question
Post by: iwannagetA on November 02, 2010, 12:23:49 pm

i got that too but i was looking for the answer in different section .. my bad :D

Title: Re: VCAA 2009 Core Question
Post by: iwannagetA on November 02, 2010, 12:31:18 pm

for c) how do we know that autumn rainfull is 5% above the average???

Title: Re: VCAA 2009 Core Question
Post by: jasoN- on November 02, 2010, 12:33:47 pm

1.05 indicates that it is 5% above average.
1 is average
if you recall, adding all SI together gives 4 (given 4 seasons), whereby the average is 1