Qualification > Math
IGCSE MATHS Doubts
mdwael:
hey I got a really hard confusing question in summer 2000 paper its page 7 (a) part were you have to draw an accuarate histogram. it says "use a scale of 2cm to represent 5 grams on the horizontal axis, and an area of 1 square centimeter to represent 5 eggs" how do I do that? can someone upload a picture of the histogram if he/she has done it before? Thanks for helping :)
Fastal:
--- Quote from: mdwael on May 18, 2010, 03:00:22 pm ---hey I got a really hard confusing question in summer 2000 paper its page 7 (a) part were you have to draw an accuarate histogram. it says "use a scale of 2cm to represent 5 grams on the horizontal axis, and an area of 1 square centimeter to represent 5 eggs" how do I do that? can someone upload a picture of the histogram if he/she has done it before? Thanks for helping :)
--- End quote ---
woah i hhave the same question
Ghost Of Highbury:
ok for this question , its best to use simple unitary method.
first get this clear...how the x-axis will be arranged..
5 grams = 2 cm
1) 35<=m<40 = 5 grams = 2cm
2) 40<=m<50 = 10grams = 4cm
3) 50<=m<60 = 10 grams = 4cm
4) 60<=m<75 = 15 grams = 6cm
5) 75<=m<80 = 5 grams = 2cm
now..1cm^2 = 5 eggs.
for the 1st set i.e 35<=m<40...say the height of the rectangle = h
thus, the area of the rectangle = the frequency = 2cm*h cm = 2h cm^2
1cm^2 = 5 eggs
2h cm^2 = 5*2h = 10h eggs. (area)
now the area = frequency
10h eggs = 20 (f)
h = 2cm
thus, for the first rectangle, the height is 2cm, and the width - 2cm (5 grams class width)
do the same for the rest..
2) class width = 10 grams = 4cm
height = h
area = 4hcm^2
1cm^2 = 5 eggs
4h cm^2 = 20h
20h = frequency = 60
h= 3cm
3) class width = 10grams = 4cm
area = 4hcm^2
1cm^2 = 5 eggs
4h cm^2 = 20h eggs
20h = 200
h = 10cm
4) cw = 15 grams = 6cm
area = 6hcm^2
6h*5 = 30h eggs
30h = 180
h = 6cm
5) cw = 5 grams = 2cm
area = 2hcm^2
2h*5 = 10h eggs
10h = 40
h = 4cm.
Ghost Of Highbury:
--- Quote from: Adzel on May 18, 2010, 02:56:34 pm ---O/N 2004 04 Q3 part (b) and (c) + explaination.....please :)
--- End quote ---
b) Water out from the pipe = 1.6cm^2 * 14 cm/sec = 22.4 cm^3 /sec
Volume of the tank - 552920.3071 cm^3
22.4cm^3 = 1 second
552920.3071 = 52920.3071/22.4 = 24683.94228 seconds = 6 hours 51 minutes
c) 1m = 100cm
1m^2 = 10000cm^2
70m^2 = 700000cm^2
552920.3071cm^3/700000cm^2 = 0.789886153 cm = 7.9mm
Nearest mm = 8mm
Adzel:
thank you A@di!!!......+rep!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version