Comments on: Mr Brewin’s Year 10 – Homework Help

By: Mr Brewin

Mr Brewin — Fri, 27 Feb 2009 22:36:33 +0000

Yup.

rachel — Fri, 27 Feb 2009 22:18:32 +0000

i tihnk so. . is the collumn i have to add up the one where i multiply freq by midpoint?

okay thanks

Mr Brewin — Fri, 27 Feb 2009 21:45:01 +0000

Find the midpoint of each group. Then multiply freq by midpoint. Add up this column, and divide by total freq.

OK?

rachel — Fri, 27 Feb 2009 20:48:12 +0000

how do u find out the mean amount spent for grouped data?? page 250 11D q3 a ii. and b ii
=]

Mr Brewin — Mon, 08 Dec 2008 21:40:14 +0000

OK – we’ll go over it tomorrow. Well done for trying!

Mrs Tibble — Mon, 08 Dec 2008 21:39:33 +0000

errrr………….. how?

rachel — Mon, 08 Dec 2008 21:23:59 +0000

oh and also for the second question i got 12x = 86?

rachel — Mon, 08 Dec 2008 21:14:21 +0000

thank you

Mrs Tibble — Mon, 08 Dec 2008 21:12:48 +0000

yes

rachel — Mon, 08 Dec 2008 20:55:24 +0000

is that the same for all of them? having to make either the y’s or x’s the same?