Mathematics Stack Exchange
Mathematics Stack Exchange

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.

In its most general definition, an average is a summary of a set of values. Normally it refers to the arithmetic mean, but other means may be employed (geometric, harmonic, etc.) or a transformation may be applied before and after taking a mean (e.g. root-mean-square).

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weighted average of interest rate

Let say that I have 2 loans. One loan has an interest rate of 5% and the other of 10%. I calculate the weighted average both loans and it is 8% (This is an example). I don't know how can you prove that the total interest yield of both loans with…
kprincipe
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Excel Weighted Average

I am trying to get the weighted avg of percentages in excel. I have followed multiple mathematical examples and excel examples all over the web and I still have not got a clear answer when you have two factors or criteria that make up the…
Jay26
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Running average by storing only a single number

Say I have ratings (1-100) for a list of movies: Guardians of the Galaxy: 92 Interstellar: 83 Wonder Woman: 95 Every time I watch one of the movies, I may provide a new rating. E.g. after watching each movie four times: Guardians of the…
Senseful
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How to calculate the minute average?

I want to know how can I calculate the average minute of a time of a match. Each match is composed by two time, each time have a duration of 45 minutes, for a total of 90 minutes. I have these data available: Position: 1 Played matches: 27 …
popop
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How to demonstrate that the average value of sinusoidal functions is zero?

I've been directed here from the Electronic engineering website, since it's more of a math question. I need to demonstrate that given in the title, given this formula: I know I have to replace i(t) with sin(t). But what interval should I choose for…
Edward B
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Is there a word for average but with multiplication instead of addition?

I came across a problem where I find the volume of a pyramid through (length * width * height) / 3. I noticed that there are three numbers being multiplied by each other, then divided by three. This reminded me of Average where you add numbers…
DMVerfurth
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A Milk solution of 60 litres contains..

A Milk solution of 60 litres contains 80% milk. How many litres of another milk solution containing 90% milk should be added to make an 84% milk solution? [Ans: 40 lit] I tried: $\dfrac {80}{100}\times \dfrac {M}{60}$ $\dfrac {M}{25}$ calculation of…
Siberan Jonah
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Class Progress Computation

I am making a program where I need to include the progress of an entire class based on the number of lessons they have taken versus the number of lessons available. I understand that for a single student, the formula is number of lessons taken…
Ash22
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Wrong Anticipated Result

I tried to calculate the average time taken to encrypt text messages of various sizes in kilobytes, but I couldn't get the results I am anticipating. I don't know where the problem is. The number of messages is 10.
Faisal Ali Gama
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Weighted Average?

Firstly apologies for vague title. If I knew what I was trying to find I'd probably be able to locate it on Google. Assume x games to be played by a team using one of two different venues. Venue A charges the team 10 dollars per game and venue B…
Simon Rigby
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Average of data-points

I am trying to solve clustering problem. After step 1 i.e putting each data-point to a cluster now I want to calculate the mean or average of all of the data-points in a specific cluster. let suppose I have some data-points like A(2,3), B(4,5),…
Roshni Amber
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(baby math) rates and average speed

I'm sorry for this low level question, since i would really like to become a data scientist i study everyday math from the very beginning, i learn through khan academy and everything was fine since i started until this question i can't really well…
A.S
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finding 6 numbers that are in a range with mean, mode and median averages

Can anybody tell me how to choose 6 numbers that have a range of 4, a median of 9, a mean of 9 and a mode of 7? so far, i have 7,7,9,11 i know the mean should be 54/6 but the last 2 number must = 20, so 2 10's would negate the mode of 7 thanks
turtleboy
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Calculating average - How to interpret

I am currently looking into a dataset, and have a question about calculating average. Assume I have the following data of the number of dogs in four different cities over the course of 4 weeks: London NYC Berlin Tokyo mon1 2 …
aprilrocks92
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Average and Profits and Percentages

The average monthly income of person in a certain family of $5$ is Rs. $1000$. What will be monthly average income of person in the same family if the income of one person increased by Rs. $12000$ per year?
user482538
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