Percentile Definition and 19 Threads

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Homework Statement We have F(x) = ∑ (1/2)^j [Sum goes from j=1 to x] For the cdf F(x), find the pmf f(x), the 25th percentile, and the 60th percentile.Homework EquationsThe Attempt at a Solution I've been doing numerous of these for continuous distributions, however this one is tricking up...

I scored in the 88th percentile in a certain personality trait and am trying to figure out the probability of that given that I'm male. I'm trying the likelihood that I would land in the 88th percentile given that I'm male. Definitions: T = trait, M = males, F = female. Given: P(T|M) = 0.3...

Homework Statement I am confused between these 2 videos . In the first videos , it's same as what i learned in pre-university education course . When we are calculating kth percentile , the value that we get is whole number , then we need to the use (the value of the current number + value...

Homework Statement I am asked to find the 60th percentile of this question , so i found that 30 x 0.6 = 18 , So , the 60th percentile is the 18th term ? Or 19th term ? I am confused . I know whether it's 18th or 19th , it's still the same . I just want to get my concept correct Homework...

Homework Statement The random variable X is normally distributed. The values 650 and 850 are at the 60th and 90th percentile of the distribution of X respectively. Find the value of the 75th percentile of the distribution of X. Homework Equations I found the above formula from internet. where...

Hello! I am a bit confused about the percentile rank. Is the value of the percentile a lower or upper bound for your score. What I mean is, if you are let's say 95 percentile out of 100 people, does it means that there is a chance you scored the highest score with other 5 people, or there are 5...

I don't know where to put this question. So, I am trying in this forum. I have this dataset [1] that contains the duration of an execution with an input size from 1.5GB to 6GB. This dataset also contains the percentile 5%, 95%, and the 1st and 3rd quartile. I am thinking in creating a gnuplot...

It seems like it should be possible to calculate the mean (usual average) from a 5-number summary of a set of numbers (min, first quartile or Q1, median, third quartile or Q3, and max). You should be able to calculate roughly what a percentile is, then by taking each discrete percentile and...

I was wondering, is there a formula that converts a given z-score to its respective percentile rank? I know I can look up the conversion in a table, but I have a lot of data, and would rather just program a formula into Excel. Obviously, there is some sort of way that whoever created the table...

I'm a little confused on how you would do something like this: I have a cumulative probability distribution H(x): 0 0.31042 1 0.67825 2 0.89149 3 0.97196 4 0.9942 5 0.999 6 0.99985 7 0.99997 8 1 and I need to find the 90th percentile of demand.. I understand...

Hello, I will only be applying to US Grad schools next year (circumstances...), but I took the GRE this year anyway cause there was no real reason not to and it would allow me to take it without too much pressure at the time. So I just got my scores: 980, in the 94-th percentile. From what I...

Hi, I recently took the AMC 8 and scored a 24 out of 25. While I was going through the statistics, I was surprised to see top scoring girls were seriously outnumbered by the boys. Out of 148,557 contestants there were 26 perfect scores for girls and 124 perfect score for boys. For score 24...

I want to know what is the meaning of percentile. what is the percentile : 23.79 means? Please give me explanation and also examples. Thanks!

I have been calibrating a sub-micron particle sizer with 1 um (1000 nm) standard. After testing the standard, the test results on my print-out: (X25 = 812.7 nm, X50 = 977.7 nm, X90 = 1389.0 nm) According to USP, the limits are +/- 6% of the reference standard values for X25, X50, and X90...

Homework Statement If a 30 percent of a reference group scored higher than you did on a test, your score would be: a)at the 30th percentile b)at the 70th percentile c)at the 71st percentile d)at the 29th percentile e)indeterminate from the available informationHomework Equations I think it is c...

Homework Statement 60% of all machines inspected were 20 years or older. Give a percentile ranking for the age of 20 years in the distribution of all ages of inspected machines. Homework Equations Don't think there are any that apply to this question :/ I found this equation...

I am not exactly sure what I am supposed to do to solve this problem: The weight of people in a certain pacific island is normally distributed with a mean of 175 lb and a standard deviation of 33 lb. They want to design a one person canoe that will be able to serve 85% of the island's...

Hello, Is there a well known method (algorithm, process, etc.) by which objects are sorted into percentile groups based on some aspect of the object such as weight or size?