You are Here: Home >< Maths

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

Announcements Posted on
Why bother with a post grad course - waste of time? 17-10-2016
1. (Original post by MirindaCream)
Also for last two questions were answers 0.04 and 0.02884
I got 0.04, but 0.072 for the second one
2. I thought it was ok however I did not get the variance of the apples question, also got 0.9 for spearmans rank
3. (Original post by MirindaCream)
Also for last two questions were answers 0.04 and 0.02884
Same
4. What did you guys get for the mean of n in the regression question and for the last arrangement question ?
5. (Original post by Jamesk123)
I thought it was ok however I did not get the variance of the apples question, also got 0.9 for spearmans rank
I got the same spearman's, the variance is just the standard deviation squared
6. i got 0.0864 for the last one
7. (Original post by Jamesk123)
What did you guys get for the mean of n in the regression question and for the last arrangement question ?
I got 6.5
8. Mean of apples was kike 146.5 and variance was 21.75. Sum on m2 was 1117168.
9. These were my answers (start an unofficial MS?) No questions numbers yet though and I think my Perms & Combs answers are likely wrong
0.81
0.216
0.924
20.9
250.8
1755.75
23218
13 apples
No outliers
rs = -1
Graph of dots for rs
rs = 0.9
0.414
0.147
Variance = 6
0.160
0.514
27720
210
1/210
0.114 (4/35)
Written Answer (Conditions for geometric I think)
0.128
0.893
0.854
0.04
0.072
10. (Original post by duncant)
Mean of apples was kike 146.5 and variance was 21.75. Sum on m2 was 1117168.
Yeah i got that. rounded the answer though to 3sfs
11. (Original post by duncant)
Mean of apples was kike 146.5 and variance was 21.75. Sum on m2 was 1117168.
I got that too 👍
12. I got 0.0864 for the very last one
13. 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).
14. (Original post by ukgjyhtrhv)
i got 0.0864 for the last one
I got the same too
15. Can someone make the interactive google doc so we can all add our answers to create an unofficial ms
16. (Original post by paccap)
Yeah i got that. rounded the answer though to 3sfs
Same
17. 1/105 probability to get ABBA? only one im not sure on
I got 6.5
ditto that was a weird q imo
19. How were you meant to work out the total output for the year?
20. 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.

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. Oops, you need to agree to our Ts&Cs to register

Updated: June 15, 2016
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Today on TSR

### How does exam reform affect you?

From GCSE to A level, it's all changing

Poll
Useful resources