Still celebrating National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x

Math / Science

The Math / Science topic primarily includes discussions of mathematics, physics, statistics and economic analysis, but also biology, chemistry and other sciences.

Share tech news, updates, or what's on your mind.

Sign up to Post

According to d-glitch:
"So roughly updating the math:  3 billion GPU / 600 ==> 5 million of the current hot mining ASIC's."

https://www.experts-exchange.com/questions/29058457/Bitcoin-rough-estimate-for-number-of-PC's-mining-Bitcoin.html

I assume this is the estimated GPU's in the world divided by the fastest Mining machine. But what is the minimum number of GPU's still running where the electricity is cheap?

I am trying to find a rough dollar cost invested in the network today, of all machines mining Bitcoin, and some feeling for the scope of the hardware used by this massive network?

Thanks.
0
Free Tool: IP Lookup
LVL 10
Free Tool: IP Lookup

Get more info about an IP address or domain name, such as organization, abuse contacts and geolocation.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

According to this great research...

https://digiconomist.net/bitcoin-energy-consumption

"Number of U.S. households powered for 1 day by the electricity consumed for a single transaction"

6.56 homes

I am wondering what the $$ cash value this much electricity is?

Thanks
0
Does anyone have a rough idea of how many PC's are in use mining Bitcoin throughout the world? And might you also know in what countries these machines are running?

If you have general data on Cryptocurrency miners, and not just Bitcoin, that is even better.

Thanks.
0
I would like to know how to compute the x-intercepts of a cubic graph based in a given equation. If there is a formula that does this, then i would like to know this formula, if not then i would like to know the steps required to compute said values.
0
Experts:

I have a statistics questions pertaining to evaluating a process.   Please see attached Excel which uses an analogy to illuminate the underlying problem.  

Upon opening the Excel, please refer to the two yellow boxes which includes the scenario.   Also, the green text box includes a quote from a colleague who reviewed the matrix.   He suggested that the proposed math (in cells C13:J13) is incorrect.  

My question and the underlying problem is shown in the blue text box.   I would welcome any thoughts on this relatively simple statistical approach.   Please provide reasoning (and maybe a link to website) so that I can learn more about this particular situation.
Math----Using-Cake-Analogy.xlsx
0
If I remember correctly hen I was sitting in math classes a long time ago, there was a simple rule to establish the number of decimals needed to keep accuracy.

My problem is that I have a number of units and a price (resulting in a market value).

For example, if I have 3,976,796.834 units and the price is 10.052580533713, the resulting MV will be 39,977,070.4400.

Now I need to define how many digits I will need to keep (and I cannot keep 12) in order to keep the most accurate value.
0
A school has been able to acquire a number of Smartboards for classroom use.  Math teachers and science teachers are the majority of the recipients.  Does anybody know of a good trainer that can show these teachers uses within a school setting?
0
What is the answer for this question
0
Mathematics
0
Hi,  I am looking to design a profit sharing scheme that would take into account the job level of the employee, the performance of the geographic region, and the individual performance level.  The first can be a number between 1 and 7 or a dollar amount, the second will be the achievement of projected profit, and the third will be a number between 1 and 5.  Is there anyway to calculate a final contribution without making it the percentage of a cap?  The total pool for each geographic regional will be a straight percentage of profits.

i.e. 15% of profits might be 10 million for ease of calculation.  For thirty employees, is there some formula that will reward each employee a portion of that 10 million based on their job level, achievement of projected profit, and ind. performance???

Thank you!
0
Technology Partners: We Want Your Opinion!
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

what property describes the number sentence?

6 + 0 = 6
0
A dice is rolled until the game is stopped. The game stops when there is a 4,5, or 6. For every number 1,2, or 3 the score increases by +1. If the game stops with a 4 or 5, the accumulated score is paid. If the game is stopped with a 6 then there is no payoff. What is the expected payoff of the game.

I thought about it as follows:
The probability that the game stops with 4 or 5 is 2/3. The probability that payoff is 0 is 1/2 that is I get 4 or 5 in my first throw. The probability that payoff is 1 is (1/3)*(1/2) i.e. I either get 1,2 or 3 in my first throw and 4 or 5 in the second.
The probability that payoff is 2 is (1/3)^2*(1/2) i.e. I either get 1,2 or 3 in my first and second throws and 4 or 5 in the third.
Then the expected value is :
2/3*sum of((1/3)^n*(1/2))*n ,where n ranges from 0 to infinity.

However, this is not giving me the correct solution which is 2/3. Also, how can I solve it using recursion?

Thanks
0
In this article, I’ll show how research, determination, and use of modern technology helped me solve a DNA mystery.
6
M.S. Steel ingot size is defined by having one bottom square base of side 3.5" and top square base of side 4.5".Both base are connected by length equal to 58". Basically it's a tapered ingot.
0
A relative told me bitcoin mining doesn't require us to pay anything, virtually 0 risk
& we get decent returns from it.  

1. Anyone can point me to articles (for newbie) on how to get started

2. Is it truly low-risk or no-risk?
0
If some butterflies can travel at 60km/hour how far will they travel in 1 minute
0
I am wondering if anyone has any feeling for the error rate on any of:

- Iris scans
- Face recognition
- Finger print

I was just wondering...

Thanks
0
What should I expect by forking the BitCoin open source code? What kinds of things can one do in customizing the code?

What language(s) is it in? What platform does it run on?

What about the code run by Bookkeepers? And the generation of the BlockChain database updates?

And lastly, what "engine" determines which algorithms need to be mined and what is managing the connections to this peer-to-peer network?

Thanks
0
I am new to reading up on BitCoin but was fascinated to be reminded that in the early days of BitCoin, people "mined" additional BitCoin on their PC's. As far as I recall, this was in exchange to turning over part of the processing power of their PC's to BitCoin for background processing.

I assume this amounted to a massive amount of additional processing power available to BitCoin.

Does anyone recall the primary uses of that kind of processing horsepower?

Why do they not need this today?

Can computers today perform at such a higher rates, this "mining" is no longer needed?

Could the addition of a BlockChain database have removed the need for this kind of processing?

Thanks
0
Important Lessons on Recovering from Petya
LVL 10
Important Lessons on Recovering from Petya

In their most recent webinar, Skyport Systems explores ways to isolate and protect critical databases to keep the core of your company safe from harm.

Stupid question, please see attached.  When measuring the actual shortest distance between SFO to Amsterdam is shows 5,425mi.  The airplane route shows longer 10k+ miles.   Why wouldn't the flight goes the shortest distance?  Or is it how the distance vs measurement shows on the map just for user's simplicity?  

google maps
0
Let's say I have 10 different categories. Each category can have a variable number of numeric values. Some might have 12 values. Some might have 8, Some might have 16.

I want to get the average of the values in each category to determine which category has the highest average (and so on down to the lowest).

However, it doesn't seem "fair" that one category is only averaging 8 values, but another is averaging 16.

So, I'd like to even this out, if possible, so that all category averages act like there are only averaging 10 values.

Does that make sense?

How would I go about doing this? Would I, for example, on the category with 16 values, do something like VALUE*(10/16) for all 16 values and then use the result of that formula to calculate the average? For example, if one of the property's value is 4, I'd do 4*(10/16) = 2.5?

That doesn't seem like it would be the ideal way to do it, however. I toyed around with PERCENTILE, but I don't think that would do the trick, either.

Any ideas?
0
Hi everyone. How do I model this in Excel? It isn't a homework question, but a real life example of why they made you do these types of problem in math class.

I am borrowing $30000 to buy a car. There is an option available to get 0% financing, but only for 24 months, which would make a monthly payment of $1250. I also have access to a line of credit which has an rate of 3.5%. Currently I have $500 per month I can pay from my account. What would total cost of borrowing be if I took the 0% loan, paid $500 a month from my account and the remaining $750 from the line of credit. Then after 24 months, I would then use the $500/mo from my account to pay back the line of credit.

I have attached a spreadsheet showing the cost of just financing the whole thing on LoC vs the cost of the above in two stages. Just wanted to be sure that it is correct.
Loan-Calculations.xlsx
0
Hi,
My friend is maths teacher in high-school abroad, she also has a masters in maths from there as well.

When she comes to US, she want to continue to teach the same subject here in US school. Can you please let me know what are some prereqs/steps for this kind of situation? like would it make sense to do a masters in math from US as well, to get into teaching in high-school, easily or would be more than that? etc

thank you
0
Dear experts:
Can someone please help me clarify the criteria to determine n and r in Permutations and combination. I think I am solving these problems by thumb rule rather on a proper understanding.
Below I have listed a few questions along with solutions where r is greater than n or i am not sure how allocate n ways to r blanks. Please help.

We know that the number of ways of filling up r blanks with n dissimilar things is nPr. The first blank can be filled with any one of the given n things in n ways.
Below I have a few examples:
Q1 In how many ways can 7 women go to 9 restaurants?
      1      2      3      4      5      6      7      8      9      
R blanks                                                            
N ways                                                            
The Permutation given is 97
Clarification: How do I determine which is n and which is r?

Q2 In an examination paper there are 8 questions each with 4 answer choices and 5 questions each with 2 answer choices. The no. of ways of answering the question if all the 13 questions are attempted is?
The Permutation given is 48 * 25
Clarification: How do I determine which is n and which is r?
Q3 In how many ways can 5 letters be posted in 6 boxes?
The Permutation given is 65
Clarification: How do I determine which is n and which is r?

Please help. Thank you
Determining-n-and-r.docx
0
X = 1   2
       3   4

y = 3   1
       4   2
how can i convert x to y????
0

Math / Science

The Math / Science topic primarily includes discussions of mathematics, physics, statistics and economic analysis, but also biology, chemistry and other sciences.