Here’s the presentations from the last few lessons – sorry it took a day or two to get them up here!
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Mr Brewin’s GCSE Statistics20 comments to Mr Brewin’s GCSE Statistics |
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Copyright © 2012 The Sydenham High School Mathematics Department Blog - All Rights Reserved |
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hi Mr Brewin
i am stuck on Q6 i dont understand how to work out the frequency density from the histogram
OK – just out at the moment, so not got book in front of me, but will get back to you tomorrow. Or anyone else out there?
ok i will wait til tomorrow
well what you have to do, is to find out the width, and then x it by the frequecy density, was is on the y axis! they are quite big number though!
i hope that helped!
Frequency density = frequency / width
(Frequency = area of bar – using the scale values)
hey mr brewin,
i am stuck on quesiton 6 like vishali and i’ve worked out the first bars data but then i don’t know how to work out the rest!!!!:(
thanks
Well the first bar is 7 squares, and represents 56 people. So each square is 56/7 = 8 people.
Now look at the 2nd bar, count how many squares and times by 8…
OK?
right…
well basically i tried to do it so i’m not sure whether it’s right or not but i managed to get an answer!!!
It’s trying that counts, Frances
However, starting a sentence with ‘right’, ‘well’ or ‘basically’ will really wind Mr Brewin up – and you’ve used all three lol!
hey mr brewin
i am still confuddled about q6. how do i find the freq density????
First bar: 7 squares. These equate to 56 people.
So each square = 8 people. So FD for that bar is 8.
Then count squares for 2nd bar: 16 squares.
16 x 8 is therefore freq for that bar.
tanks mr brewin i think i get it now:)
where is the page put up with all of the presentations from chapter 1-4 what we’ve done so far?? if not when is it being set up because i am trying to sort out my folder…:)
thanks also mrs tibble if you read this when do you want me and aysha??
Hi Rachel,
It’s OK, I don’t need you in person now. Because the e-mail account was ready, I was able to register us just using Aysha’s name. If you check your school e-mail, you should have received my information e-mail with username etc for the Challenge website.
JT
hey sir…when will you be able to put the powerpoints of the chapters up????
hi mr brewen.
im doing the homework from today and i cant remember how to find the percentiles from the tables. how do you do it?
actually dont worry. i think i got it
For Q6b on p145…I’ve got 15 as the IQR and 32 as the LQ, so when I do 32-15 you get 17…so shouldn’t 12 be an outlier, yet in the answers at the back it doesnt have it there (just so you know I was using the answers to check!!!) Can you help me please!
Um…I really don’t understand the stats homework. My notes don’t help me…
Hi Rachel, isn’t it 1.5 x IQR to decide the outliers? JT