IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: candy on May 27, 2009, 02:10:09 pm
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50/50--------full marks
45+/50-------between 45 and 50
40+/50-------between 40 and 44
30+/50-------between 30 and 39
30-/50-------below 29
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50/50, actually.
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discuss all da qiestions....
last ques..wat did u get by observing...dat m-1/2s and m+1/2s
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it was like 18.2-7.1 and 18.2+7.1 i dnt remember the values off the curve
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it was like 18.2-7.1 and 18.2+7.1 i dnt remember the values off the curve
Did you get around 160 or so?
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I got 160 too..... :)
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me 2.... :)
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ne1 remembers da answers to da 1st q??
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i also got 160...
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wat was da 1st question ??
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The first question was finding the mean.
I got 997. What about you guys?
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ya evn i 996.8
wat abt da 2nd part of this q ??
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ya evn i 996.8
wat abt da 2nd part of this q ??
Should leave the answer to 3s.f. so 997.
Anyway, what was the second part of the question? I forgot.
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da prob dat exactly 2 of 3 chosen cartons hav volume greater den 1002
my ans ws like.....(.25*.25*.75)^3 =0.000103 ???
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oops i did 3C2 * .25^2 * .75 = .141 this is what i did for part ii) of question 1 ???
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insane boy
you are right!!
and the guy above it, actually what you should have done is (0.25 x 0.25 x 0.75) and MULTIPLY by three! rather than cube it!
anyway you'll get one mark out of the two :)
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ya...insane yur ans is correct..:)
stupid mistake
sh*t
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i m a girl By the way!
lol
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;D do u guys wanna discuss other answers i m ready to contribute :)
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Q PnC
i i dont remember
ii 5!x6!
iii (4!x3!)x2
Q zoo trip
p(elephant)=0.25
P(camel)=0.25
P(tractor) =0.50
den dere was this tree
P(frightened)= (0.25x0.6)+(0.25x0.7)+(0.50x0.8)
P(camel, given not frightened)=(0.25x0.3)/(1-P(frightened))
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For The last ques..
Mean = 18.2
S.D = 14.2
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Q PnC
i i dont remember
ii 5!x6!
iii (4!x3!)x2
Q zoo trip
p(elephant)=0.25
P(camel)=0.25
P(tractor) =0.50
den dere was this tree
P(frightened)= (0.25x0.6)+(0.25x0.7)+(0.50x0.8)
P(camel, given not frightened)=(0.25x0.3)/(1-P(frightened))
Answer for the first questiojn was a number which had like lots of 3s in it..
333333000 (something like that, cant remember)
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hey...i did some really stupid mistakes in the last questi0n...the last two parts actually...i couldnt find the mean and s.d. any idea how much marks it may cost me? i had found (summision-fx) and and (summision fx^2) correctly i know, but had divided it by some other number than (summision f) :S
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i guess u will lose 2-3 marks in da 2nd last part
u will get all the marks in da last part if your method ws correct using the sd u got in the previous part
:)