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[astarmathsandphysics]

Olywill do

[°o.O-hash94-O.o°]

topic is now sticky!

[**!!superexcited!!!**]

hey have a prob in math for these type of sums....plz help..

Grade                           1 2 3 4 5 6 7
Number of students        1 2 4 7 4 8 2

Students are chosen at random, one by one, from the original 28, until the student
chosen has a grade 5.
Calculate the probability that this is the third student chosen

[**!!superexcited!!!**]

Physics quest...

When dey say start temperature scale on Y axis at 40^o...Do u start at origin or point above dat??
And wen dey say draw a circuit diagram to represent a voltmeter connected across 3 lamps how shld d dig look...Just wanted to confirm d answer for this...

[Ghost Of Highbury]

hey have a prob in math for these type of sums....plz help..

Grade                           1 2 3 4 5 6 7
Number of students        1 2 4 7 4 8 2

Students are chosen at random, one by one, from the original 28, until the student
chosen has a grade 5.
Calculate the probability that this is the third student chosen

the probability that the 1st student does not have a grade 5 is -> 28/28 - 4-28 = 24/28

the probability that the second student does not have a grade 5 is --> 27/27 - 4/27 = 23/27

the probability that the third student HAS a grade 5 is -> 4/26

multiply them

[**!!superexcited!!!**]

which pastpaper/year is this q from?

and yea.. its the anser 4/26 ??

October 2007 paper 4....No, answer is 92/819

[Ghost Of Highbury]

Physics quest...

When dey say start temperature scale on Y axis at 40^o...Do u start at origin or point above dat??
And wen dey say draw a circuit diagram to represent a voltmeter connected across 3 lamps how shld d dig look...Just wanted to confirm d answer for this...

u put that "cracked sin curve" ka symbol between the origin and the next point (all on Y axis) and then put the point above that as 40⁰

something like the attached one

PS : I'm not sure on this one.

and yea...the lamps are connected in parallel or series?

[**!!superexcited!!!**]

u put that "cracked sin curve" ka symbol between the origin and the next point (all on Y axis) and then put the point above that as 40⁰

something like the attached one

PS : I'm not sure on this one.

and yea...the lamps are connected in parallel or series?

can u do both..

[@d!_†oX!©]

u put that "cracked sin curve" ka symbol between the origin and the next point (all on Y axis) and then put the point above that as 40⁰

something like the attached one

PS : I'm not sure on this one.

and yea...the lamps are connected in parallel or series?

nothing attached aadi

[**!!superexcited!!!**]

nothing attached aadi

yea cant see anythin...

[Ghost Of Highbury]

nothing attached aadi

oh...sry..


the temp. and parallel attached

[Ghost Of Highbury]

i've shown 1 voltmeter because i assume that all three lamps are identical..

and yea..the question said a voltmeter across 3 lamps..

so is it acorss all three lamps or across 1 of them...??..

which pastpaper/year?

[Ghost Of Highbury]

October 2007 paper 4....No, answer is 92/819

i edited my above answer

[@d!_†oX!©]

but aadi if it says a voltmeter across 3 lamps then it should be attached parrallel to the 3 lamps together...not just 1.....i suppose!!??

[**!!superexcited!!!**]

somebody told me it was like this..