# Questions tagged [means]

In probability and statistics, mean and expected value are used synonymously to refer to one measure of the central tendency either of a probability distribution or of the random variable characterized by that distribution. For a data set, refers to a central value of a discrete set of numbers: specifically, the sum of the values divided by the number of values.

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### How to “denormalize” a standard deviation?

Lets say I have a vector of variables which have all been standard normalized with $(\mu_n, \sigma_n)$ by doing the operation $\frac{\mathbf{y} - \mu_n}{\sigma_n}$. I then have a model which predicts ...
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### Can weighted means of functions intersect?

This question came to me as part of a larger problem in game theory I was trying to figure out. $F$ is a family of continuous functions defined in the range $[0,1]$. Initially $F$ contains only the ...
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### Problem with an iteration

I have problems to understand the following iterative argument. I don't understand, how the denominators arrise, i.e. how the facultys build. When I plug in the inequality into itself, I get what ...
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### How to find the probability of the number of data

I have an exercise, i try to finish all of the question. I stack for the last one. Anyone can help me? I attach the question. I find the solution for (i) 2 (ii) 2.63 (iii) 0.055 And i need your help ...
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### Determine point value in quadrilateral

This is a rephrased question after I gained a better understanding of the problem. I have an X,Y plane with one point in each quadrant. Each point represents a value, it is a function result for ...
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### How to measure the understanding level of a new concept that was taught to a group of students

Let us say I am an online teacher and I have to introduce a new topic in the class today. Let us say the topic is "Solving a Quadratic Equation". There is an online community of students from ...
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### Proper way to calculate the mean of a dataset - use the entire dataset or the frequency table values?

I'm not trained in mathematics, but I took a course about using statistics in understanding hotel data. One step of the process requires us to calculate the mean rate of a collection of stay records. ...