[Raeesa]

Ok i'm tutoring my bro for his gcse in maths and was marking his work when i realised i've forgotten sooo much of the gcse stuff. Hence I have a couple of q's i would be eternally grateful for some advice on:

1. Frequency Polygons: The point u place in the graph should be the mid point of the interval right?

2. Stratified Sampling: If your asked to work out how many people u need from each category for a sample of say 50 ppl and when u do the formula (number of ppl in category/total number)*50 for each category and u have had to round up or down.. n u get perhaps 51 at the end when u count how much.. wat do u do??!! is it ok to leave it like that??!

thanks!

[YOUSUFofSD]

jeez, its been sooo long, good luck sis!

[Raeesa]

Originally Posted by YOUSUFofSD

jeez, its been sooo long, good luck sis!

lol i know its fun but a bit of learning curve going back to all this.. no worries u'll have to do this with yr girls before u no it!

[ameen]

Originally Posted by Raeesa

1. Frequency Polygons: The point u place in the graph should be the mid point of the interval right?

Yes, you should plot the frequency at the midpoint of the interval (BBC - GCSE Bitesize - Maths | Data Handling | Frequency polygons)

2. Stratified Sampling: If your asked to work out how many people u need from each category for a sample of say 50 ppl and when u do the formula (number of ppl in category/total number)*50 for each category and u have had to round up or down.. n u get perhaps 51 at the end when u count how much.. wat do u do??!! is it ok to leave it like that??!

Is it possible to post the question here? The rounded total should add up to 50, not 51, as far as I know.