Author Topic: VCAA 2009 Core Question (Read 815 times) Tweet Share

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

$:-\$

kenhung123 · « **Reply #1 on:** November 02, 2010, 12:20:22 pm »

Yea, whats wrong with it?

iwannagetA · « **Reply #2 on:** November 02, 2010, 12:20:46 pm »

im getting wrong answer

iwannagetA · « **Reply #3 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

jasoN- · « **Reply #4 on:** November 02, 2010, 12:22:29 pm »

188/.78 = 241.02 = 241 = the answer

iwannagetA · « **Reply #5 on:** November 02, 2010, 12:23:49 pm »

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

iwannagetA · « **Reply #6 on:** November 02, 2010, 12:31:18 pm »

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

jasoN- · « **Reply #7 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

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