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90th percentile is simple another way of saying that 9% scored above and 90% scored below (the other 1% being the number 90).
For example, if you take a type of standardized test in high school, if you do well, you are at the 90th percentile, meaning 90% of students scored lower than you and 9% scored better. You can not be in the 100% percentile, because you cannot score better than yourself.
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What does it mean to be in the 90th percentile?
It means that the value of the observation is in the highest ten percent. Whether that is good or bad depends on the context.
What is the 90th percentile for the following 12 20 50 60 80 90 90 110 140 180 260 340 380 1600?
368.
On an IQ test if you missed one out of ten questions what is your IQ?
First, an IQ test of only ten questions is not going to be very accurate. One out of ten would be the 90th percentile. Which would be somewhere around 125.
How do you write 90th?
That would be ninetieth.
You 121 a good IQ score for a 11 year old?
A score of 121 puts you in about the 90th percentile of all other eleven year olds, which means that you scored higher than 90 percent of all other kids your age if you were tested professionally by someone who is qualified as in a psychologist or psychometrist.
