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IGCSE MATHS Doubts

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the_grim_reaper:

--- Quote ---can someone plzzzzzzz explain me paper 4 june 2009, question 2d, very confusing!!!!!
--- End quote ---

Friend from the previous question you'll know that ?(FX) here is 148. and ?(F) is 50
 
Now  ?(FX) is  144 + x (x is sum of those 10 rolls)
?(F) is 60 (the total number of rolls)
                               148 +x
mean is 2.95 so 2.95=---------
                                60

so 60 X 2.95= 148 + x
so X= 177-148=29 (sum of those 10 rolls)

now mean is sum/frequency= 29/10=2.9

the_grim_reaper:
the ? stands for (SIGMA)

ksitna:
i neeed help with this
oct nov 06
8 b) iv)

SoONa:

--- Quote from: ksitna on May 18, 2010, 10:33:36 pm ---yes thts correct :D

--- End quote ---

yaaaaaaaaaay thank u

dsiddiqi11:

--- Quote from: deadman786 on May 18, 2010, 10:57:15 pm ---Friend from the previous question you'll know that ?(FX) here is 148. and ?(F) is 50
 
Now  ?(FX) is  144 + x (x is sum of those 10 rolls)
?(F) is 60 (the total number of rolls)
                               148 +x
mean is 2.95 so 2.95=---------
                                60

so 60 X 2.95= 148 + x
so X= 177-148=29 (sum of those 10 rolls)

now mean is sum/frequency= 29/10=2.9

--- End quote ---


Thanks mate, understood it very well

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