I haven't done any maths for a few years but I was wondering if you can work out the decile/percentile of a particular number if I had the mean and standard deviation but not the individual numbers? I can probably have the n value too if needed and it's normal distribution.
Stats help - can you work out decile or percentile with this info? Watch
- Thread Starter
- 10-06-2016 23:25
- 11-06-2016 02:04
if the underlying population is normal ( this has to be true or the following is false), by working out how many standard deviations the number is away from the mean and then using that value to find percentile with standard tables. Eg if mean = 10 sd =2 and number is 13 that's 1.5 standard deviations from the mean which if you compare with standard tables (http://www.mei.org.uk/files/pdf/formula_book_mf2.pdf) will give you a percentile value of around 93