Math paper 42 help

[kukdykyu]

Hi I have many questions regarding math paper 42
http://papers.xtremepapers.com/CIE/Cambridge IGCSE/Mathematics (0580)/0580_s08_qp_4.pdf
1- page 5 question c
2- page 6 Q5A ii
3- page 7 Q6C why can't I say equal

 

[kukdykyu]

and another one page 8 Q7 ii,iii,iv and how do i get the values

 

[Igcse giver]

for page 5 question c u have to find the frequency density which = frequency/class width for each

 

[resh123]

here... i did page 5 question C...for ya... hope u can understand

http://tinypic.com/r/2qk5qmx/5