The Student Room Group

OCR (Not MEI) S1 Wednesday 8th June 2016

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Reply 60
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
I thought it was ok however I did not get the variance of the apples question, also got 0.9 for spearmans rank
Reply 62
Original post by MirindaCream
Also for last two questions were answers 0.04 and 0.02884


Same
What did you guys get for the mean of n in the regression question and for the last arrangement question ?
Reply 64
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
i got 0.0864 for the last one
Reply 66
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
Reply 67
Mean of apples was kike 146.5 and variance was 21.75. Sum on m2 was 1117168.
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
Written Answer
Written Answer
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
Reply 69
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
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 👍
I got 0.0864 for the very last one
Reply 72
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).
Reply 73
Original post by ukgjyhtrhv
i got 0.0864 for the last one


I got the same too
Reply 74
Can someone make the interactive google doc so we can all add our answers to create an unofficial ms
Reply 75
Original post by paccap
Yeah i got that. rounded the answer though to 3sfs


Same :smile:
Reply 76
1/105 probability to get ABBA? only one im not sure on
Reply 77
Original post by madberry1
I got 6.5


ditto that was a weird q imo
Reply 78
How were you meant to work out the total output for the year?
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.

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