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

1. (Original post by Anon_98)
I'm stuck on part 4)b) in this paper, can anyone help pls:

https://1a388b28f5ce9318f837a64962fc...%20Edexcel.pdf

I know that mean= ∑xf

but I've forgotten how to find x?

I worked it out as the class width + multiplied it by the frequency but it was obviously wrong.
Find midpoint of the foot length values then find ∑xf
Mean is ∑xf divided by total frequency
2. (Original post by kiwifruit99)
Bricking myself for tomorrow... Oh well I just need 55/75 min to get an A so hopefully fingers crossed ✌🏽

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I think.. at this point, unless you are cramming, get enough sleep. Good luck!
3. Will the paper tomorrow be easier or harder?
4. (Original post by kiwifruit99)
X is the midpoint so for the first one-
10 + 12/ 2 = 11
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(Original post by Susi3b)
Find midpoint of the foot length values then find ∑xf
Mean is ∑xf divided by total frequency
Ah, thanks a lot!
5. (Original post by ChilliLemon)
Here is the jan 2016!!
Thankyou, do you have the ms aswell

6. A lot of people were asking for this so I made a list up till the chapter on probability. Everything after that is included in the formula booklet. I know it's a bit late but I guess people will be waking up early tomorrow to revise anyway...
Good luck!! X 😊

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7. (Original post by kiwifruit99)

A lot of people were asking for this so I made a list up till the chapter on probability. Everything after that is included in the formula booklet. I know it's a bit late but I guess people will be waking up early tomorrow to revise anyway...
Good luck!! X 😊

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Thanks! I actually stayed up after suhoor ._.
8. Good luck everyone!

I'm going to be doing the exam with less than 3 hours of sleep. Fantastic start!
9. (Original post by undercxver)
Good luck everyone!

I'm going to be doing the exam with less than 3 hours of sleep. Fantastic start!
GO TO BED.

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10. only had 3 hours sleep yolo
11. (Original post by SuperHuman98)
only had 3 hours sleep yolo
same *high five*
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How does coding work with the mean, variance and standard deviation?
13. How do I work out the percentages of a box & whisker plot!!

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14. (Original post by undercxver)
Good luck everyone!

I'm going to be doing the exam with less than 3 hours of sleep. Fantastic start!
Same here.I couldn't sleep much due to e3 excitement.
How do I work out the percentages of a box & whisker plot!!

For part a the lowest mark is Q1 which is 30
For part b the lowest mark is Q3 which it seems to be around 46? And this is because 75% of the data lies above Q1 and 25% above Q3.

Hope this helps and good luck x
16. (Original post by mal100)
For part a the lowest mark is Q1 which is 30
For part b the lowest mark is Q3 which it seems to be around 46? And this is because 75% of the data lies above Q1 and 25% above Q3.

Hope this helps and good luck x
Thank you!!, If the question was asked the other way round so if they asked for the highest mark for (a) & (b), what would the answer be? & Good luck to you as well!!
17. Formula for skewness of quartiles ?
Formula for skewness of quartiles ?
I think it was something like

If Q3-Q2 > Q2-Q1 - Positive Skew
If Q3-Q2 < Q2-Q1 - Negative Skew
If Q3-Q2 = Q2-Q1 - No Skew / Symmetrical
19. (Original post by veryam*****ious)
I think it was something like

If Q3-Q2 > Q2-Q1 - Positive Skew
If Q3-Q2 < Q2-Q1 - Negative Skew
If Q3-Q2 = Q2-Q1 - No Skew / Symmetrical
And don't mix this up with the quartile coefficient of skewness.
20. dya reckon it will be an easy or a hard paper?

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