# Tagged Questions

The sum of several numbers divided by their count nicely summarizes the overall size of the numbers involved in a single value.

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### Get the minimum value for multivariable

I need a way to calculate the very minimum of each variable for a grade average. Each grade variable have a weighing percentage (I don't know if it's the right term) The weighing sum must be the ...
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### Basic algebra problem for weighted averages

This question has me completely stumped for some reason, I would appreciate a bit of help. If you have 20 pounds of coffee for $1.80 a pound And then add X amount of coffee for$1.44 a pound How ...
224 views

### Mean of a discrete function

I have a set of finite variables (~20) which when plotted are forming a decaying exponential function. I want to know is there a better way to calculate the average of this function than by just ...
23 views

### What is the Term for the Center of Mass Equation Structure

What is the term for the generic structure of this form of equation: SUM(Mi * Xi) / SUM (Xi) It is the same as the center of mass calculation.
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### Calculate the average grade Leslie must make in order to receive a B for the math class?

Leslie is taking a math class. This is how the class is graded. Test 1 13% Test 2 13% Test 3 13% Lab 1 10% Lab 2 10% Lab 3 10% Lab 4 10% Final Exam 21% She received a 93% on Lab 1, 70% ...
313 views

### calculus integration, average height of point on semi circle

i was recently watching a single variable calculus video of mit 18.01, lecture 23. in that it is said that average height of a point on semicircle with respect to arc length is 2/pi.I have a hard time ...
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### In the loop average computation

I want to compute the average of a set of number, which is constantly increasing. I guess it's simple, but I'm struggling here: Let's say: 1st iteration: m(i)=a+b/2 2nd iteration: m(i+1)=a+b+c/3 ...
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### Finding the average of multiple ranges

I conducted a survey where participants inputted a range for their weekly tablet usage. For example, someone was able to say they used their tablet "11 - 15 hrs/week". How do I find the average hr/...
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### Formula for normalising with respect to average

I have a 5*5 grid (as in the figure). At each point there are 5 dishes of varying numbers of bacteria. I'd like to write a formula which calculates the average of these 5 and then divides by the ...
444 views

### Algorithm to Get a Product score based on rating

I am trying to device a algo for product score. Here are the inputs User rates a product on 5 different criteria out of 10 Each criteria has a different weightage with all adding up to 100% There ...
1k views

### Calculating Average Percent

I have two ways to calculate the average starting price of an auction item compared to it's actual value. ...
743 views

### Weighted mean properties when using angles

Consider a joint angle $j$, such that $-180^{\circ} \lt j \lt 180^{\circ}$, with the true value unknown. Given two estimates of $j$, I wish to combine them using a normalised weighted mean, such that ...
218 views

### Calculating Average…

I know its simple problem, but i want to know if it can be solved some other way around.Here goes the problem. Input: 234 , 54678 , 34987 Problem is to calculate how many of the numbers(by number i ...
771 views

### Taking the time average of the product of two waves

How might one go about calculating the time average of the product of two identical waves with different phases? For example, what would be the time average of: $$\cos(k x-w t) \cdot \cos(kx-wt+a)$$...
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### Balancing merges of timed event

I'm making a game that can fuse few guns to create an equal gun and I need to compute the fused properties. First off I thought this was easy - I just took the inverse of the sum of the inverses of ...
158 views

### I'm having trouble calculating ratings

I'm not a wiz at math and this problem has me a little stumped. I need the average score out of 5 but it's a little different how I do it. I have 5 fields, field one is rating one, field two is ...
23 views

### Method used to calculate average time spent

I need to calculate the average time spent on a single article. My data set ranges from a few seconds up to an hour. Dataset Summary .png file I'm currently using mean to calculate the average but ...
22 views

### Aproximation for the variance (sum)

Given that we know The mean of a population $\tilde W(t) = \sum_{i=1}^{n}f_{i}(t)*W_{i}$ The variance of the population in the previous step $Var(0) = \sum_{i=1}^{n}f_{i}(0)*(W_{i}-\tilde W(0) )$ ...
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### Find upper bound from average value

I have been give a function, its average value, and the lower bound of an interval, I am trying to find the upper bound but I am a bit lost on how to do that. Here is what I have so far:  f(x)= \...
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### achievability of average

Out of a textbook. Informally, the goal is to show that if from a given set of values ($2^n$ many values) in the range of $[0,m]$ (for fixed $m,k$), more than half are less than \$m\cdot (1-\frac{1}{2^...
23 views

### Trying to Calculate Averages for Record Types

I am trying to compute the averages for the following (3) types of records but not sure if I am getting the correct results: 387 Total record count (valid/invalid/other) - created by 45 total users ...
24 views

### Detecting unusual activity

How would one go about detecting unusual order flow in an intelligent way. That's very broad, so let me narrow it down. I have a trading system with clients entering number of orders every day. At ...
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### Calculating the average with Limited memory and without using the count

I am having a flow of numbers on an embedded device, and I cannot store the flow of numbers and would like to calculate the average. I have checked around and found one way was to do like this Avg= (...