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# OCR (Not MEI) S1 Wednesday 8th June 2016

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1. (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!
2. (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
3. (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
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
5. (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
6. (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
7. (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
8. (Original post by ukgjyhtrhv)
i got 0.0864 for the last one
me too
9. (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
But z was the output
I'm sorry, I meant the mean of z!
11. (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?
12. Does anyone else think that was one of the easiest papers out of all the past exams?
13. What did everyone get for the group of 12 question. I got 166320 i think.
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
15. can we make a markscheme?
16. I got 1/70 for the ABBA question??
17. 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
18. (Original post by catwat99)
I got 1/70 for the ABBA question??
same, but my first answer was 12/35 idk
19. (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.
20. (Original post by catwat99)
I got 1/70 for the ABBA question??
So did I 🙌🙌

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