How do I find out how many people have a score above a certain value?

Percentiles give the percentage of people who have a score below a threshold score.

Percentile (score) = 100 $$\frac{\mbox{n} \leq \mbox{score}}{\mbox{N}}$$

100 - Percentile (score) = 100 $$\frac{\mbox{n} \gt \mbox{score}}{\mbox{N}}$$

The percentiles for each score are routinely outputted using the frequency procedure in SPSS.

FREQUENCIES VAR=SCORE.
EXE.

In R the percentages of people with scores equal or below each observed score can be obtained by running

for (i in score) {
perc[i] <- 100*sum(score<=i)/length(score)
 }
perc