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# Edexcel S1 - 15th June, 2016 [Exam Discussion] Watch

1. (Original post by lfcrules)
How the hell did I get 0'13???????????
I dont know xD it was like P(D)XP(?)=intersecion as the variables were independent
2. What did people get for the median?
And what did people put down for the written bits?
Probabaly a little bit easier than last year...61 for A?
3. It's 34x0.5=17cm bro
4. (Original post by Alexelele)
For the histogram question did anyone else get 17 I think, It was basically the frequency of the class
yes I got that!
5. (Original post by iMacJack)
e(r) = 0.45, second bit first part 0.475, second but second part 0.375

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Yep

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6. That was one of the worst Statistics papers. I couldn't even answer the last two questions
1.
Can't remember part a)
b) wiggles were the response variable as they are what changes based on the distance
c) the regression line I got was 0.722+0.014d
d) I subbed in 350 and got w=5.69
my answer was reliable because it was within the range of data

2.
a) 2p+Q=0.5
b) Q=0.15 P=0.175
c) 2.2 something like that?
d) E(R) =0.45
e) Sara's chance = 0.475 Rebecca's chance = 0.375

3.I don't remember much about this question other than the PMCC being around -0.7 and the extra data causing the PMCC to increase because it showed a positive correlation.

4.
a) 0
b) t=0.03
c) u=0.22
d) 0.45 and 15/37
e) 33 customers ordered dinner

5.
a) median baby weight was 3.47
b) s.d was 0.689
c) showed mean was 3.43
d) used that guys normal distribution to get that 0.2546 babies were under 3kg
e) showed that in the table only 9 babies were under 3kg whereas using his distribution I got that 12 babies were under 3kg hence he is wrong to assume the distribution

6.
a) 6.68% of men took over 300 minutes
b) the speedy chap needed to run his marathon in under 206 minutes
c) the probability was 0.18/0.5 (0.36)
8. Anyone else mess up calculating the standard deviations?
9. (Original post by SalazarSlytherin)
Lowers SD because the average spread is less
Ahh i put lowers standard deviatoon because the value of fx^2/fx decreases and mean stays the same
1 mark??
10. (Original post by Batman_Stark)
Number of customers at the end of that venn diagram question---did anyone get 48?
I got something like 48.83 which rounded up to 49 I think... Possibly 47.83 which rounded to 48.
11. How did you find the exam overall?

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13. Also how were you meant to calculate Syy bruh
14. (Original post by aynnihsan)
I couldn't get the answer for the rebecca and sarah winning thing 😭😭😭

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me neither wtf were you meant to do!
15. (Original post by Exavior)
How did the value of the the extra baby affect the mean and thr standard deviation.

Was that dude right to model around the normal distribution?
I said the mean wouldn't change because the baby's weight was the same as the mean weight so t shouldn't change.

I just assumed that the standard deviation would change
16. (Original post by SpoodleDoodle)
I can't believe how easy that was😅
But, it was only easy if you knew the concepts!! Last question was very tricky but I think I pulled it off!!

For those who haven't entered the exam hall yet make sure to revise normal distribution before you go in!!

And probability lol

And discrete random variables!!

Chapters 5, 8, 9, 7 with knowledge you should've known from chaps 1-3!!

How was it for you guys ?!!
It was easy alright...

But you have to agree it was the hardest s1 paper you have ever seen. You would be ignorant to think otherwise.
17. (Original post by HasanRaza1)
Also how were you meant to calculate Syy bruh
Syy was equal to the standard deviation squared times by 8
18. Well that was "fun"

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19. (Original post by HasanRaza1)
Anyone else mess up calculating the standard deviations?
Pretty sure I failed the exam since I couldn't even remeber the equation -.- literally the word exam ever :'(
20. (Original post by LivKennedy)
me neither wtf were you meant to do!
I struggled as well. How the hell were we supposed to do that

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