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What is the 90th percentile?
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.
What is the 90th percentile for the following 12 20 50 60 80 90 90 110 140 180 260 340 380 1600?
368.
Total cholesterol in children 10 to 15 years of age is assummed to follow a normal distribution with a mean of 191 amd a standard deviation of 22.4 what is the 90th percentile of total cholesterol?
The basic formula we need is the Standard Normal Distribution formula (see related link) which is Z = (x - mean)/std dev. Solve for x, and we get: x = mean + z*std dev. From the Z table (see related link), area = 0.900 (your 90% in decimal form) we get the closest z value of 1.28 (from area = 0.8997). We can now solve for x, the value at the 90th percentile. X = 191 + (1.28)*22.4 or 219.672. Cholesterol, to my knowledge, is always given in whole numbers, so the value is 220 (rounded up).
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.
What is the percentile rank of the score 20 in a unit normal distribution that has a population mean of 21 and a variance of 4?
It is the 31st percentile.
