Qualification > Math
IGCSE MATHS Doubts
Baladya:
Hey guys i have an imp tip...
If u have a group of data in a table annd u want to find the median, here is the way.
If the total number of data (cumulative frequency) is an even number do this: Calculate n/2. Calculate (n/2)+2. Get the average of them. The average tells the postition of the median(undeer which group).
If its an odd number: Don't remember xD ;D Anyone knows :P???
Hope this helped...
Baladya:
--- Quote from: ksitna on May 11, 2010, 07:59:12 pm ---loll hey baladya
i just realised we usually have the same number of posts :)
--- End quote ---
NOOO U CHEATED xD ;D Hahaha Weird :D
Ghost Of Highbury:
--- Quote from: ~VIN1094~ on May 11, 2010, 07:49:39 pm ---like this one .. =|
--- End quote ---
can u give the answers too plz? maybe i can help..
Shazizzzle:
--- Quote from: ~VIN1094~ on May 11, 2010, 07:49:39 pm ---like this one .. =|
--- End quote ---
Here, for e.g., 0-10 has 300 patients.
f.d=15 (count squares height)
frequency=300 (given in table)
c.w (class width)= 10 (0-10, the interval width is 10)
f.d = k X f/c.w
15 = K X 300/10
15=K x 30
K=15/30
K=1/2
Now, the area of the bar is 5 X 15 = 75
Frequency is 300
So, frequency for one small block: 300/75 = 4
and, the number of small blocks in 1 cm^2 = 25 (5 X 5)
SO, frequency of 1cm^2= 4 X 25 = 100 patients.
Now, part b.
The height, of f.d is 20.
We need F (i.e no of patients to fill table)
f.d = k X f/cw
20 = 1/2 X f/30
20 = f/60
f= 20 X 60
f=1200
Vin:
Page 6 q. 13 .. post a q. A@di is always there to ans it !! :P Thanks ..
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version