Qualification > Queries

How was your S1

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Freaked12:

--- Quote from: Dude22 on May 27, 2010, 12:25:50 pm ---I got probabilities=1 but they didn't = the proof in the next part, so I know they are wrong

The tree diagram was easy
They are not independent but they are mutually exclusive, you can prove it using the formula for independent prob and ME.

I also messed up the last parts of Q7

I'm worried about p3 now since the newest P3s are hard and I make many mistakes

--- End quote ---

God damn
i fergot the exclusive and independent forumala.i lost 3 marks there.

Dude22:
Well there were 3 marks in each part

In a previous paper a similar question awarded marks like this

1 - Formula
2- Mathematical proof / calculation
3- Conclusion - eg independant or not

So if you got the rest right, but no formula you only lose 2  ;D

Ykov:
Lol, my paper was just plain ridiculous. Question 1 tried to trick us into using binomial, but it was only worth 3 marks, and my working was just plain horrible. The permutation in Question 4 was nearly impossible but I think I got the method marks for that. The rest of the paper was fine :O

CHEMMASTER6000:
its not a trick . they give 1 mark for stateing the bionomial expressoin 1 mark for subbing the correct value and a mark for answer thus 3 marks.

but true q4 is madnesss. im assuming you were doing 63 same one i did

Ykov:
You can't use binomial fyi. The probability of drawing a red sweet is not constant throughout the trial, which is a requirement to use binomial expressions. Once you draw a red sweet, the probability of drawing the next red sweet would have also changed. Thus, unless they say "the sweet was replaced after each drawing" using binomial would just be....strange and contradictory to what I've studied

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