Year 12s: what will be the first way you research your future options? >>

S1

when doing interpolation- if its grouped data do we have to 1) change the ranges i.e +0.5,-0.5 (if needed) and use in the interpolation and 2)add 1 to the total Cumulative frequency before multiplying it by 0.5,.0.25.0.75 to find the quartiles

Reply 1

TSR Jessica

Sorry you've not had any responses about this. :frown:

Are you sure you’ve posted in the right place? Posting in the specific Study Help forum should help get responses. :redface:

I'm going to quote in Puddles the Monkey now so she can move your thread to the right place if it's needed. :h:

Spoiler

Reply 2

gdunne42

Original post by games211

Which examiner?
For edexcel S1 you don't do the "add 1" in step 2 for grouped data. you are recommended to calculate using the exact term value found from n/4, n/2 or 3n/4

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(edited 8 years ago)