# Questions tagged [average]

Averages summarise a set of values in one way or another. Without further qualification it most commonly refers to the arithmetic mean, but other averages such as root-mean-square exist.

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### Calculating a new average without having the full set of no.s [duplicate]

Say we have the below data: 100 120 80 110 The average of these is 84.5 Is there any way, I can store some data from this original data and calculate new average ...
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### Recalculate average based on subset of poisson distribution

Assuming a series of independent events, probability of the event occurring on a given day is a poisson distribution with λ=0.8. This includes probability of event ...
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### Decision to use median or average in a skewed or uniform distribution [closed]

Goal: To determine whether to use the median or average (or a weighted combination of the ...
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### How to solve the average?

Question: "The average marks of the students in four sections A,B,C and D together is 60 %. The average marks of the students of A,B,C and D individually are 45%,50%,72% and 80% respectively. If ...
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### How do I calculate for the change in value?

Question: "In a village the average age of n people is 42 years. But after the verification it was found that the age of a person had been considered 20 years less than the actual age , so the ...
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### why is average of a random subset the same of the initial set

This feels like a really simple question, plus it looks very intuitive, but I can't find a formal proof or anything that proves it. I have an initial set X with n values. I extract Y, a random subset ...
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### Giving weights to multiple choice question with multiple groups

So my problem is the following: I have made a survey composed of only one multiple choice question. This question has 5 possible answers. For simplicity, lets say the answers are Blue, Green, Red, ...
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### How to keep numbers within an average without them being all the same

Background: I am developing an app to make calculations for worldbuiding, following the instructions given by the YouTube channel Artifexian. In one of the videos, he mentions a formula to keep the ...
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1 vote
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### Find analytically the statistical average $\langle f\rangle$ of function $f(x)$ when sampling x a large number of times.

I have a function $f_n(x) = \frac{1}{3} + 2x \left( \frac{1}{3x} \right)^n$ Where n is a natural number larger or equal than 3 and a constant. I am sampling the value of x numerically in the interval ...
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### Summation about an inverse-variance weighting average expression with a unique random variable considered

The context is about astrophysics but this is actually a mathematical issue. We want to define a physical observable which allows to derive some estimations of errors on parameters fiducial values. ...
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### Estimating Right Censored Values

I'm a newbie at Math, and I am just getting my feet wet when it comes to understanding math and statistics so please forgive my ignorance or question if it's already been answered or if materials are ...