NBME 24 16% (NBME Answers)

NBME 24 Answers ↦

nbme24/Block 3/Question#10 (19.9 difficulty score)
Serum cholesterol concentrations are measured ...
16%🔍
tags:

+4
submitted by m-ice(326),

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sThi eqinosut lony roensccn wemon ni het 4-550 age .orpug heT gorpu has a mnea fo 642 dan natsardd tvdinieoa of 0.5 ehToere,fr lla hstoe htiw vselau agteerr nath 296 rea all tesho vobea oen dstraadn t.oinaedvi 3/2 of lal asluve no a lrnmao iioutsntbrid rae htiniw oen daanstrd diaoeintv ni etiher .iociedrtn rThfe,eoer /31 ear doiuset fo hsit ni eitrhe t,inidcreo neginma 3/1 of oenmw eavh a ulaev sesl tanh 691 ro errgate thna 92.6 If we tplis ttha in alhf to olyn ceohos eshot egrtera tnha ,692 ew tge 6/1 e,mwno cwhhi si otbua %.16

guillo12 Sorry, but there is not other way that I can understand this? +1

fulminant_life @guillo12 basically 67% fall within 1 sd. That means that 33% are +/- >1sd. So taking only those with above 296, you only look at those >1sd above the mean which is 16.5% . The other 16.5% are those >1sd below the mean. +12

guillo12 Thank you!!! @fulminant_life +

+3
submitted by sunshinesweetheart(69),

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oolk ta FA 2901 pg. 162

in a G,sansiau 66% era iinhtw 1 SD nda 95% itwnhi 2 DS

thsi si gihh ildye fa

+2
submitted by bmd12(4),

1 SD= 68% of the population 2 SD= 95% of the population 1 SD= 99.7% of the population

They tell us the standard deviation is +/- 50 from the mean.

So women b/w ages 50-54 had a mean of 246. 1 SD= 196-296 meaning 68% of females in this range are between this range.

That means 32% are not within this range (100-68=32). They are either above OR below this range.

The question is asking how many will be above 296. So you divide 32 by 2 so that you get the percentage of only those falling above 296.