In probability why do the fractions change as you go along a branch....????HELP!

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ON THIS BITESIZE QUESTION AND IN GENERAL ,I JUST DON'T UNDERSTAND WHEN AND WHY DO THE FRACTIONS CHANGE 

HERE'S THE LINK :http://www.bbc.co.uk/schools/gcsebitesize/maths/statistics/probabilityhirev1.shtml -THE FIRST QUESTION....THE BLUE RED ONE,the fraction suddenly changes to out of 8 ,how can that be when there are only 7 marbles in total?

Posted Sun 10th June, 2012 @ 16:35 by anonymous

11 Answers

  • 1 vote

In answer to your question RajaK,

2 litres= 2000 ml

so 2000/300=6.666666..... so the largest number of glasses that can be filled are 6.

Hey random question :D, Are you originally from India? If you are whereabouts in India are you from because I'm originally from India?  (sorry getting bored with revision!!!)

Answered Sun 10th June, 2012 @ 17:10 by Dilly
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can someone help me with this question you might find it easy as its from the foundation paper the diagram shows a man and a bus the man and the bus are drawn to the same scale the man is of average hight

write down an estimate for the height of the man

find an estimate for the length of the bus

Answered Sun 10th June, 2012 @ 16:36 by RajaK
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well think about how big a man is approx-5ft8/9--or 2metres,then a bus will probs only be a couple of foot taller.....

Answered Sun 10th June, 2012 @ 16:42 by anonymous
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oh ok thanks for that and theres this other question i dont understand :/

Nimer has a jug.

There are 2 litres of water in the jug.

Nimer wants to fill some glasses with water from the jug.

He will fill each glass with exactly 300 m

l of water.

(b) Work out the largest number of glasses that Nimer can fill.

Answered Sun 10th June, 2012 @ 16:44 by RajaK
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 Hey anonymous

In the one about blue red there are two bags Bag A and Bag B. One marble is picked out of Bag A which has 7 marbles and then another is picked out of Bag B which has 8 marbles. The fraction changes because there are two separate bags. Hope that helps! :)

Answered Sun 10th June, 2012 @ 17:06 by Dilly
Edited by Dilly on Sun 10th June, 2012 @ 17:06
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no LOOOOL 

Answered Sun 10th June, 2012 @ 17:14 by RajaK
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That really weird, you have a very indian name !!! :D

Answered Sun 10th June, 2012 @ 17:16 by Dilly
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i just wrote my name short on this LOL

Answered Sun 10th June, 2012 @ 17:17 by RajaK
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Ok now I feel stupid:s

Answered Sun 10th June, 2012 @ 17:18 by Dilly
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HAHAHAH LOOL dw :)

Answered Sun 10th June, 2012 @ 17:19 by RajaK
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ohhhhhh.......lol can't believe i didn't spot that!, revision is making me a bit crazy...thanks anyway:)

Answered Sun 10th June, 2012 @ 20:41 by anonymous