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1d
revised What is the meaning of percentile?
added 13 characters in body
1d
comment How many hamburgers can be ordered, if there can be eight toppings?
"I think there is no sufficient information"...what more information do you think you need? If you figure this out, you may be able to at least give an answer of the kind "if we allow this, then x, if we do not allow it, then y"...
Sep
25
comment What is the meaning of percentile?
Where is the part in grey quoted from? It is equivalent to what the OP's teacher said, and still in grave contradiction to what your links say. "n% of the highest mark" does not work for A-B-C-D-F grades, yet percentiles (and ranks) can be calculated. Also, by that logic, if the two richest persons somewhere own 3 and 1 bazillion, respectively, one is in the 100th percentile and everyone else in the 33rd or below.
Sep
25
answered What is the meaning of percentile?
Sep
25
comment What is the meaning of percentile?
I still do not think we have the same interpretation of what the teacher meant. The teacher references a single "highest achiever", not the number of 'lower' or 'higher achievers' (as in "examinees...who scored at or below...").
Sep
25
comment What is the meaning of percentile?
@Arthur "not the most common way of defining it"? I would say the teacher is defining a totally different concept. If someone makes 10% of what Warren Buffett makes, are they in the 10th percentile of the income distribution? I'd say they are still far above the median (i.e. 50th percentile).
Sep
25
comment What is the meaning of percentile?
The explanation at your Percentile Rank link does not mention the highest score that the OP's teacher referred to. I do not see how the teacher could have meant what is explained at the link.
May
22
comment Finding the positions of 2 points in a simple 2D geometric configuration
@SDV Increase the angle at C, then E and F move farther apart. Thus, EF should be a strictly increasing function of the angle, and I would take "EF=L" as indication that this length is given.
May
20
answered Why are polyhedra related to the prime numbers 2, 3 and 5, but not to the prime number 7?
May
20
comment Limits Problem worked 2 ways gives 2 different answers
You divide something that is supposedly 2 by $x$. $x\to\infty$. Two divided by something going to infinity approaches $0$. $0$ is the result you get. Why are you surprised? ;-)
Mar
5
revised Find $z$ of a point in a plane in 3D space
added 868 characters in body
Mar
5
comment Find $z$ of a point in a plane in 3D space
I know, I saw your age in your profile. :) Have you seen systems of linear equations before? I would have added some more wikipedia links, they may not be helpful beyond the the introduction before the table of contents (e.g. Coplanarity. Some things that come up when googling "vectors introduction" look more helpful.
Mar
5
revised Find $z$ of a point in a plane in 3D space
added 292 characters in body
Mar
5
answered Find $z$ of a point in a plane in 3D space
Mar
5
comment Find $z$ of a point in a plane in 3D space
Imagine $a=b=c=0$ and $d=1$. Then your four points form a (non-regular) tetrahedron and there may be many or no points inside it with given x and y. Also, even if $A,B,C,D$ form a quadrilateral in space (that is, they all lie on the same plane), I do not think they will form a square unless $a=b=c=d$.
Mar
5
revised Find $z$ of a point in a plane in 3D space
geometry tag added
Mar
5
suggested suggested edit on Find $z$ of a point in a plane in 3D space
Mar
5
comment Find $z$ of a point in a plane in 3D space
(1) Is your problem only the z coordinate or also whether the point is side the shape? (2) Can you be sure the four given points are in the same plane? (3) Are you familiar with vectors?
Feb
21
answered How do I complete this identity?
Feb
18
awarded  Organizer