SagarSHAH

i still think its 1/2.....w1 and w2 doesnot make sense to me,,since its clearly mentioned in question the prob to pick a WHITE ball as i already sed.... dnt u have the answer???? lol topgun,,,,u call it easy and u urself make it complicated.....

u knw must be knowing the formula z = (x-m)/sd here,69% of the observations are concerned which coresponds to z = 1. that is observation is in the region +/- 1 Sd.... so substitute values of x,m and z...u get sd as 10... hope my way is correct and its clear,,,,((U may refer to graph from wikipedia,,U knw the link..)

is it 10?? btw the link is not proper,,,

topgun i think second and third possibilities in ur Second soln are same....u have numbered the ball and ias not given in question,,,,they just ask prob to find WHITE ball and not the prob to pick w1 or w2.....

is it 1/2:blush::blush::blush:

can sumone tell me the steps of calculating SD,,,i just wanna know dat in the final step do we divide (sum of squared differences) by 'n' (no of values in set) or we divide by (n-1)...coz in ETS manual it is 'n' and on various sites it is (n-1)....

1) 21--33:hmm: confident abt 2)---it is 96%,,, 3) 16%.......i think now i m rite......

Syed...dude,,,,u Can Avoid Sin Calculations,,,whn U Identified Dat Aoc Is A 30-60-90 Triangle,,,u Knw Its Sides Are In Ratio 1: Root3 : 2.....so No Need To Use Sine-cos Formulas.....they Can Lead To Calculation Mistakes....

Ya,,thanx

It Is Already In Inverse Proportion,,,dats W1 On Rhs And W2 On Lhs...it Works...take Dif Examples And Chk It Out...

Guys A Quick Formula For This Type.. M1*D1*T1*w2 === m2*d2*t2*W1... M--man,,, M1 And m2 D--days,,D1 And d2 T---time ,,T1 And t2 W--work,,W1 And w2.. Substitute Watever Is Given And Ignore Which Is Not Der,,,like Ignore Days In This Example..

thanx suja.....i will do the same....

thanx.. both of u...i really looking forward to increase this thread after my xam( by posting the required things all at one place))... MAY GOD BLESS US ALL....

hey guys,,,i have my GRE is on 20 oct,,,,wat do i do tomorrow??? suggest me??? **THOSE WHO HAVE GIVEN GRE ALREADY WILL HAVE EXTRA TO SAY..... let this thread be for last day revision,,,INCLUDES EVERYTHING DAT IS NEEDED,,math+ verbal.... this cud be useful to ALL of us atleat on the last day...

no prob,,guys,,,,dat sum was from PP,,,verson3.1,,,u will come across it....never mind,,thanx,,,

Looking at ur skills,, i think of defering my GRE by say 1 or 2 yrs.....m not joking...

100210*90021-------100021*90210 :crazy::crazy::crazy: i had to multiply both like a stupid.....this was 2nd question....i knw der is a method to take common ,,but i cudnt find out...

Mwm Thats Is Ok Iff Lines Are Parallel,,,,but I Read The Question It Is Not At All Mentioned That Lines Are Parallel,,i Dnt Think We Can Make Such Assumptions......mwm Can Make Some Sense From Kaplan's Explaination I Posted Earlier???

is it 9??

its from kaplan,,,it sez dat the third angle in the triangle containing 30 and x is ADJACENT TO 70degrees and so it is 110 and furthur x=40... i dint understood the capitalised words...how third angle is adjacent to 70degrees....is it a misprint.but i dnt think so,,,if it is den it is very easy sum,,and i doubt this level comes in gre......hlp guys,,,,whr r the mathematicians of TM,,MWM,,TOPGUN,,seagull,,kronique and OFcourse Suja.....guys plzzz hlpp...

ans is 1/4.. give ur xplaination topgun..

ok,,guys,,can u xplain----probability that a chord randomly selected is greater or equal to radius????

ok,,i got the point,,,,but this prob i m sure i wudnt be able to solve in exam,,,,hey everybody((except topgun)),,dnt u find this little difficult???? shud we expect such sums in real GRE????

totally confused with topgus ans,,,,stickler was more convincing.....

thanx,,,most elaborate explaination for ny prob i have ever seen,,,u r correct stickler....ans is D