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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 40o...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:
--- Quote from: priyu22 on November 01, 2009, 04:16:35 am ---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
--- End quote ---
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
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