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# OCR MEI - S1 - 20th May 2015 watch

1. i think i messed up hypotehis one...
i did h0: u=15.6
h1 u>15.6
then used what i had for the value of 19 showed it was greater than 0.01 and concluded...
do you think i will get any marks for this
2. Will i get penalised for putting my answers to x dp instead of sig figs?
3. 8)Iv) I put "0.0009" where answer was "0.000942...." have I rounded correctly? I'm sure I have
4. (Original post by Bellbird)
how did everyone found it? :s
What did you get for the last question? how did you do the cherry one, and all three orange?
i got 7/114 i swear no one else got this cos i did

6/20*5/19*14/18

did any one else get this???
5. (Original post by swegucation)
i got 7/114 i swear no one else got this cos i did

6/20*5/19*14/18

did any one else get this???
Don't think you had to do the 14/18 on the end

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6. (Original post by swegucation)
i got 7/114 i swear no one else got this cos i did

6/20*5/19*14/18

did any one else get this???
That would be if he got the one he wanted on the 3rd try, it didn't specify that, if just said more than 2 tries so it's just 6/20*5/19=3/38

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7. (Original post by swegucation)
i got 7/114 i swear no one else got this cos i did

6/20*5/19*14/18

did any one else get this???
Well first off you should have 4/18 rather than 14/18, but either way that term is irrelevant. (6/20)*(5/19)*(4/18) gives the probability of having to choose more than 3 chocolates until he finds one he likes; the question asks for the probability of more than two, which is just (6/20)*(5/19).
8. (Original post by Kichelle)
Don't think you had to do the 14/18 on the end

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Kichelle

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9. (Original post by Darcy1)
Will i get penalised for putting my answers to x dp instead of sig figs?
Nabeel

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10. (Original post by joe12345marc)
8)Iv) I put "0.0009" where answer was "0.000942...." have I rounded correctly? I'm sure I have
Sometimes they penalise answers given to just 1sf, though if everything else you had done was to a certain number of decimal places or you had written the unrounded answer earlier on then you will probably be fine.
11. (Original post by jpetersgill)
Nabeel

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U know it
How did u find it
12. (Original post by Darcy1)
U know it
How did u find it
Pretty decent. If you are nabeel, why were u on an FP1 forum?

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13. (Original post by jpetersgill)
Pretty decent. If you are nabeel, why were u on an FP1 forum?

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Me n my mate share this acc and he does f maths
14. (Original post by iamJOM)
Well first off you should have 4/18 rather than 14/18, but either way that term is irrelevant. (6/20)*(5/19)*(4/18) gives the probability of having to choose more than 3 chocolates until he finds one he likes; the question asks for the probability of more than two, which is just (6/20)*(5/19).
wouldnt it be 14/18 bc thats of the ones he likes (20-cherry)

but anyway hopefully get 1 mark for multiplying first fractions think ive got around 67 anyway FINGERS CROSSED
15. (Original post by Darcy1)
Me n my mate share this acc and he does f maths
Who's that?

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16. (Original post by AlexParmenter)
I think I didn't get the show that P(x=6)=91/216 one because I excluded the cases where more than one of the dices were 6, as I thought that wouldn't count because X=The highest score on any of the three dice so i assumed if more than one of them rolled a 6 then 6 wouldn't be the 'highest'

I think the easiest way to do that one was to do P( all less than 6) = 1- (5/6)^3.

I think :/
17. any other further maths resitters? what do you all need for A overall in A2?
18. (Original post by jpetersgill)
Who's that?

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His name is charles uzuegbunam, you probably know him
19. (Original post by Darcy1)
His name is charles uzuegbunam, you probably know him
4 real? Haha

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20. For the mean and standard deviation on Q1 it said find x. Does that mean you wouldn't have to put units (£) on the answers?

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