Edexcel AS S1

Does anyone know how to do question 3 on the edexcel gold paper 3? It gives you that x is 10-15 16-18 and f is 15 9 respectively. It also tells you that 10-15 has a width of 2cm with height of 5 then asks you to find height and width for 16-18.
Thanks

Reply 1

negatron

12

First for the height you need to calculate the frequency density. Remembering to use the boundaries. Once you've got the f.d for 10-15 divide this by the height so you get the f.d for 1cm height. Then divide the f.d of 16-18 by the f.d for 1cm and you'll get the height. Use the same method for the width. Find the class width of the 10-15 and divide this by the width in cm. To get the c.w for 1cm width. Then divide the c.w for 16-18 by the c.w for 1cm width and you'll get the new width.

Hope this made sense!

Reply 2

issyafd1

OP

Thank you so much. This has changed me up on so many papers and the exam is tomorrow so this was a life saver :-)

Original post by negatron

First for the height you need to calculate the frequency density. Remembering to use the boundaries. Once you've got the f.d for 10-15 divide this by the height so you get the f.d for 1cm height. Then divide the f.d of 16-18 by the f.d for 1cm and you'll get the height. Use the same method for the width. Find the class width of the 10-15 and divide this by the width in cm. To get the c.w for 1cm width. Then divide the c.w for 16-18 by the c.w for 1cm width and you'll get the new width.

Hope this made sense!