Author Topic: Pls help as soon as possible  (Read 6725 times)

Offline Most UniQue™

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Pls help as soon as possible
« on: May 14, 2011, 07:43:05 am »
O/n 2008 q 6b (ii)

Pls help got exam on Monday plzzz help!!

Offline EMO123

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Re: Pls help as soon as possible
« Reply #1 on: May 14, 2011, 10:02:59 am »
O/n 2008 q 6b (ii)

Pls help got exam on Monday plzzz help!!
which paper and which board(as, a or Igcse)?

Offline Most UniQue™

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Re: Pls help as soon as possible
« Reply #2 on: May 14, 2011, 12:25:03 pm »
which paper and which board(as, a or Igcse)?

Oops sry p42 igcse

Offline Ghost Of Highbury

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Re: Pls help as soon as possible
« Reply #3 on: May 14, 2011, 12:31:02 pm »
O/n 2008 q 6b (ii)

Pls help got exam on Monday plzzz help!!

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
divine intervention!

Offline Most UniQue™

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Re: Pls help as soon as possible
« Reply #4 on: May 14, 2011, 01:00:07 pm »
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

Where did u get 2 frm ?

Offline Most UniQue™

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Re: Pls help as soon as possible
« Reply #5 on: May 14, 2011, 07:25:36 pm »
Plz answer its very important got exam on monday! plz i really appreciate it!

Offline SauD~

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Re: Pls help as soon as possible
« Reply #6 on: May 14, 2011, 07:28:38 pm »
Plz answer its very important got exam on monday! plz i really appreciate it!
Dude come on msn -.-

Offline Most UniQue™

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Re: Pls help as soon as possible
« Reply #7 on: May 14, 2011, 07:32:30 pm »
Dude come on msn -.-

cn u scan it to me, i wont be able!

Offline Ghost Of Highbury

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Re: Pls help as soon as possible
« Reply #8 on: May 14, 2011, 07:33:25 pm »
Where did u get 2 frm ?

read the question again. the class width is 2 for 20-22

divine intervention!

Offline Most UniQue™

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Re: Pls help as soon as possible
« Reply #9 on: May 14, 2011, 07:43:55 pm »
read the question again. the class width is 2 for 20-22



I dnt c any 2! and wt do u mean by class width??

Offline SauD~

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Re: Pls help as soon as possible
« Reply #10 on: May 14, 2011, 07:56:44 pm »
I dnt c any 2! and wt do u mean by class width??
its the numbers in between... For example: 20<x<=30  class width is 10
                                                          23<x<=29 class width is 6

Length in a histogram is found by this formula:
Frequency density= Frequency/ class width

so

as you will see that 11.5 is found by 115/2 x 5
now do the same process including that >>>> x 5
you will receive the answer ^_^

Offline Most UniQue™

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Re: Pls help as soon as possible
« Reply #11 on: May 14, 2011, 08:00:49 pm »
its the numbers in between... For example: 20<x<=30  class width is 10
                                                          23<x<=29 class width is 6

Length in a histogram is found by this formula:
Frequency density= Frequency/ class width

so

as you will see that 11.5 is found by 115/2 x 5
now do the same process including that >>>> x 5
you will receive the answer ^_^

i got everything exce[t x 5? why x 5?

Offline Ghost Of Highbury

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Re: Pls help as soon as possible
« Reply #12 on: May 14, 2011, 08:04:44 pm »
Again, read the question

"On a histogram, the height of the column for the 20<m<=22 interval is 11.5 cm."


The class is - 20<m<=22

The class width = 2


divine intervention!

Offline Most UniQue™

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Re: Pls help as soon as possible
« Reply #13 on: May 14, 2011, 08:08:13 pm »
Again, read the question

"On a histogram, the height of the column for the 20<m<=22 interval is 11.5 cm."


The class is - 20<m<=22

The class width = 2




hmm got it Thanks a lot n saud Thanks a lot and plz answer the question which i asked... Thanks

Offline Most UniQue™

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Re: Pls help as soon as possible
« Reply #14 on: May 14, 2011, 08:10:43 pm »
oh saud i got it, u mean if v multiply 2 by 5=10 and 115 divided by 100, its 11.5 so dats y v use 5 , right?