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OCR (Not MEI) S1 Wednesday 8th June 2016

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Reply 80
Avatar for duncant
duncant
2
Original post by NikitaPond
For the abba question, what did people do? I think I put the wrong numbers into the calculator, but my method was:
3/7 * 2/6 * 2/5 * 1/4 (picking the letters AABB).
There are 6 ways to arrange AABB, so multiply by 1/6. This gets 1/420. I think then multiply by 4! as it does not matter what order we pick the cards from the initial 7.


I done wjat u done but only multiplied by 4 at the end instead of 4!
Reply 81
Avatar for h3rmit
h3rmit
15
Original post by toosie
I got 0.0864 because either Marie fails twice and nadia succeeds twice (0.8^2*0.3^2) or Marie scores, nadia scores, Marie fails, nadia scores (0.8*0.2*0.3^2) or Marie fails nadia scores Marie scores nadia scores (same thing) so it's (0.8^2*0.3^2) +2(0.8*0.2*0.3^2).


This seems correct actually
Reply 82
Avatar for madberry1
madberry1
OP
1
Original post by Ozil5
How were you meant to work out the total output for the year?

I did an arithmetic progression with a being 17.6 and d being 0.6 comes to like 200 and something
Original post by madberry1
I did an arithmetic progression with a being 17.6 and d being 0.6 comes to like 200 and something


You calculated the mean value of n in the previous question and the mean is given by mean = (sum of n) / n(12) so to find the sum of n you multiply the mean by n
Reply 84
Avatar for h3rmit
h3rmit
15
Original post by Ozil5
How were you meant to work out the total output for the year?


I just found the sum of z using the mean of z and n=12
Original post by Ozil5
How were you meant to work out the total output for the year?


I did the mean output times by 12
Reply 86
Avatar for paccap
paccap
Original post by Ozil5
How were you meant to work out the total output for the year?


I did the mean for x multiplied by 12. Forgot what i got though
Reply 87
Avatar for erfredi
erfredi
Original post by ukgjyhtrhv
i got 0.0864 for the last one


me too
Reply 88
Avatar for madberry1
madberry1
OP
1
Original post by rektron
You calculated the mean value of n in the previous question and the mean is given by mean = (sum of n) / n(12) so to find the sum of n you multiply the mean by n


But z was the output
Original post by madberry1
But z was the output


I'm sorry, I meant the mean of z!
Original post by duncant
Mean of apples was kike 146.5 and variance was 21.75. Sum on m2 was 1117168.


how did you work out the sum of m^2?
Does anyone else think that was one of the easiest papers out of all the past exams?
Reply 92
Avatar for duncant
duncant
2
What did everyone get for the group of 12 question. I got 166320 i think.
Original post by madberry1
I did an arithmetic progression with a being 17.6 and d being 0.6 comes to like 200 and something


yh i got something like 250.8 i think
can we make a markscheme?
I got 1/70 for the ABBA question??
What did people get for the question where it said what is the p of X equaling each other and how did you do it
Original post by catwat99
I got 1/70 for the ABBA question??

same, but my first answer was 12/35 idk
Original post by student199919
yh i got something like 250.8 i think


Same, just did ((1x0.6 + 17)) + ((2x0.6 + 17))...... and i think i got that.
Original post by catwat99
I got 1/70 for the ABBA question??


So did I 🙌🙌

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