Qualification > Math

Err.. Need help. - Histograms [maths]

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Ghost Of Highbury:
any past paper question which asks to find the height of other rectangles??

Muho:

--- Quote from: eddie_adi619 on May 18, 2009, 09:23:53 am ---any past paper question which asks to find the height of other rectangles??

--- End quote ---

Yeah, Oct/Nov 2008
Q6 b (ii)

Ghost Of Highbury:
okk..heres how u do it..
---------------RULE---------------------------------------------------
if class width = n * standard width, then, height = frequency/n
--------------------------------------------------------------------------
first lets find the standard width...the  height given = 11.5, its frequency is 115
therefore 11.5 = 115/n...=> n = 10
class width = 10 * standard width
2              =  10 * standard width
therefore standard width = 0.2
-----------------------------------------------------
now use this formula with standard width 0.2 to calculate the heights..
height = fequency * (standard width/classwidth)
1st - h = 35 * 0.2/10 = 0.7
2nd - 11.5 (given)
3rd - h = 26 * 0.2/2 = 2.6
4th - h = 24 * 0.2/6 = 0.8
----------
chk the markscheme for verification
good luck
byee

Muho:
Cheers, helped me this time. xD thanks for explaining guys. come closer paper 4, come closer *drools*

Ghost Of Highbury:
happy to help u!!

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