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

someones already answered 1 and 3 so:

2. There are a lot of things you can do on your calculator. You can work out:
mean
variance
standard deviation
sum x^2, sum y^2 etc
Normal distribution

someones already answered 1 and 3 so:

2. There are a lot of things you can do on your calculator. You can work out:
mean
variance
standard deviation
sum x^2, sum y^2 etc
Normal distribution

Effects of coding on Sxx, Syy & Sxy?

Edit:

Sxx has the same effect as variance

Sxy has the same effect as standard deviation

how do you work out normal distribution on your calculator? is there a special function or something??
thanks!

If you have the casio fx-991ES plus
press mode 3(stat)
then AC
Then shift 1, 5
The following options will come up
P(
R(
Q(

P( is when you have p(z<?)
R( is when you have p(?<z<0) OR p(0<z<?)
Q( is when you have p(z>?)

thank you!!!!!!!!!
unfortunately i dont have this model calculator

so if the code was y= x - 20 /100,
sxx and sxy would only be affected by the 100?
would you like... times them by 100?

how does coding effect Sxx, Sxy and Syy im confused

Can someone please help answer this as soon as possible.


I don't need the answer to the question, I just need to know what the question says as I have yet to do it and there are weird symbols.

If anyone can send me what the question says that would be appreciated

If I had to guess, it would be $P( R \cap Q^c) = 0.15, P(Q) = 0.35$ and that's it. Maybe you can find an alternative source of the paper?

Hi guys! Does anyone know the answer to this?

Is the sd affected by multiplication or addition
Is the mean affected by multiplication or addition

Hey, im trying to do a question about mean/standard deviation but just can't get my head around it. It's S1 June 2013 (R), Q3)E).

paper link: http://qualifications.pearson.com/content/dam/pdf/A%20Level/Mathematics/2013/Exam%20materials/6683_01R_que_20130517.pdf

mark scheme link: http://qualifications.pearson.com/content/dam/pdf/A%20Level/Mathematics/2013/Exam%20materials/6683_01R_msc_20130815.pdf

I just don't get what I'm meant to do. I've haven't attempted it because i dont know where to start . any help would be appreciated

Its asking for the number of tomato plants with a yield of more than1 standard deviation above the mean so:
mean + 1 standard deviation= 18.3 (based on answer to part c)

18.3 lies in the group 15<y<25
so the number of plants >18.3
= (upper yield - calculated yield)/ class width * frequency
(25-18.3)/10 *12 = 8.04
you then add the 4 for the next group also as they clearly have a yield >18.3
so total is 12.04 so 12 plants