Qualification > Math

S1 and S2 DOUBTS HERE!!!!

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immortal:
5b)
i>  mor girls dan boys
   so   3g   2b
         4g   2b
         5g   0b

8c3*6c2+8c4*6c2+8c5
=1316

ii>Total of 8+6=14 students  11 if cousins r ignored.
   with cousins  11C2(wit 3 cousins already included)
   without dem   11C5
  so  55+462
       =517

immortal:

--- Quote from: simba on May 25, 2010, 07:25:54 pm ---mmmmm...another question in  Nov.09 first varient num.3..

--- End quote ---
Will ans in 15min

immortal:
P(85 < x < 100)
                                         
           = 0.5 – P  [z < {(85 ? 100)/7}]           
                                                                   
                       
           = 0.5 – P (z < – 2.143)                     
           = 0.5 – (1 – ?(2.143))
           = 0.9839 – 0.5
           = 0.484       

simba:
why is it times 0.5..

simba:
another question in Nov.09 2nd varient num.1.....how to get standard  deviation ???

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