Also note that you can 'switch' tails via the argument lower.tail. By default, it is TRUE.
> qnorm(p = .20, mean = 181, sd = 7.3, lower.tail = TRUE) [1] 174.8562 > qnorm(p = .20, mean = 181, sd = 7.3, lower.tail = FALSE) [1] 187.1438 Cheers, Josh On Sun, Aug 1, 2010 at 4:04 PM, Arun Kumar Saha <arun.kumar.s...@gmail.com> wrote: > I gave you hint only, however whatever you done is correct. > > > > On Mon, Aug 2, 2010 at 4:30 AM, n.a.s <nn.r...@gmail.com> wrote: >> Hi, >> >> But i didn't understand why you did it like this qnorm(40/200)?? >> >> I already found the answer qnorm(.20,181,7.3) and qnorm(.80,181,7.3) >> >> >> Thanks. >> >> >> On Mon, Aug 2, 2010 at 12:33 AM, Arun.stat <arun.kumar.s...@gmail.com> >> wrote: >>> >>> try >>> qnorm(40/200) >>> -- >>> View this message in context: >>> http://r.789695.n4.nabble.com/Help-normal-distribution-tp2309730p2309735.html >>> Sent from the R help mailing list archive at Nabble.com. >>> >>> ______________________________________________ >>> R-help@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-help >>> PLEASE do read the posting guide >>> http://www.R-project.org/posting-guide.html >>> and provide commented, minimal, self-contained, reproducible code. >> >> > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.