q-----2? - goal13

[ArchivalUser]

A med student gave his USMLE step 1 and found his score is 1.5 SD above the mean.What is his percentile.

[ArchivalUser]

1 SD above mean=84
84+6.7=90.7


90.7

[ArchivalUser]

so whats it

[ArchivalUser]

yes sammi is correct

[ArchivalUser]

i didnt knew the 84 stuff....

[ArchivalUser]

84?

[ArchivalUser]

1..5 SD above the mean means nearly (0.15+2.4+6.75) % of the observations are above this value =9.2 % ....he would be 91.8 percentile


sammi made probably a rough estimate

[ArchivalUser]

for whoever wants to know simply

http://library.thinkquest.org/C0122162/s...iation.htm

[ArchivalUser]

@goal13 - can you please explain where you got 0.15, 2.4 and 6.75 from please? i haven't brushed up on my biostats in a while and i cant seem to figure it out...??

[ArchivalUser]

Below the mean=.15%+2.4%+13.5%+34%=50%
same values above the mean

Hence 1.5 SD above the mean=
50+34+13.5/2=90.75%

Or
100-0.15-2.4-13.5/2=90.7%