quiz questions :( (1 Viewer)

HSC :(

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hey i was jus goin through the quiz questions and im totally thrown off cos these questions r NOTHING like the questions we went through in the workshops... theyre like a million times harder... :(

can anyone plzzzzz help me with the first question at least plzzzzzzzzz

1. Given S Xi = 20, S Yi = 22, S Xi Yi = 3, S Xi2 =t 75, S Yi2 = 50, n = 15
Evaluate:
(a) S (3 + Yi) + S (5Xi)2
(b) S (5Xi + 4Yi)2



thanx a bunchhhhhhhhhh
 

Halo

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a) = n*3 + SYi + 25*SXi2 = 45 + 22 + 1875 = 1942

b) = 25*SXi2 + 40*SXi*Yi + 16*SYi2 = 75 + 120 + 800 = 995
 

elizabethy

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i think the ques were simple...not dat hard!! i got them easily......n i enjoy ecmt.....nething that involves maths .....im obsessed with it !!! :D
 

Left-ism

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Originally posted by elizabethy
i think the ques were simple...not dat hard!! i got them easily......n i enjoy ecmt.....nething that involves maths .....im obsessed with it !!! :D
youre a loser
 

elizabethy

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:rolleyes: :uhhuh: atleast im better than many others !!
 
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xiao1985

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Left-ism said:
youre a loser
loser or not loser, i find maths interesting ~~~ and i am more or less obessed with it too...
i i don't see why enjoying and getting good marks in maths makes u a loser =p
if that's true, what does it make u if you are gettin crab marks???
 

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