It is the minimum value.
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You would need to know how many questions were on the original test and what number of questions correct would be in the 8.6 percentile. Most tests do not give this data. If you can find it out, then number right / total number on test x 100 gives the percentage. 50 percentile might mean a 70% if it was an average test, or for a hard test 10 percentile might mean a 30%. Without the above information you cannot directly convert one to the other.
Null means zero or invalid.
That's right, the 90th percentile is the top 10%.
A percentile is a measure of the relative position of the outcome of an experiment. 11.27 percentile means that 11.27% of the outcomes were lower and 88.73 were higher. However, it does not provide any information on the level of that outcome.
It is a whole number that is 1000 less than zero.