Standard Definition and 1000 Threads

I had this problem on a quiz and obviously got it wrong, I am confused about how to set this question up and what to solve for: In a large city, the average retail price of a pound of grapes is $1.79, with a standard deviation of 18 cents. Between what values must be the price of at least 15/16...

In other words, can dark matter be reconciled with GR without drastically changing the idea that force is due to space-time curvature? and in the case of the standard model is there any thoughts of how the force of dark matter is transmitted via the exchange of a particle? It seems that this...

Hi guys, I hope someone is able to help me with this, I'm currently stuck on a problem. 1. I was given some data (in continuous, grouped form) regarding phone call times for a call center agent and asked to represent the data using the most accurate form of average. I initially calculated...

Hi guys, I hope someone is able to help, I'm currently stuck on a problem. I'm having trouble justifying which representation is more accurate for my data; either mean with standard deviation or median with IQR. I've calculated both averages for the my data, however I was advised by someone...

Homework Statement I have to calculate the standard deviation Homework Equations http://0.tqn.com/d/statistics/1/0/M/-/-/-/standarddev.GIF The Attempt at a Solution 0.64 0.4096 2.06 4.2436 0.16 0.0256 3.24 10.4976 1.74 3.0276 1.06 1.1236 4.04 16.3216 1.56 2.4336 1.3 1.69...

Problem: I need to use the Monte Carlo method to generate the mean, variance and kurtosis of the standard normal distribution. It has to be coded in Matlab, so there are two parts to this question: 1) The theory 2) The code Any help on either is appreciated. My attempt: To find $E[X]$ for a...

Homework Statement Suppose that we observe the redshifts and apparent fluxes of a sample of standard candles. When observed at a distance of 1 Mpc, the standard candles are known to have a flux F1Mpc = 1. From this sample of standard candles, we can measure the Hubble constant H0...

Hi everyone, :) I have a little trouble understanding what Canonical basis means in the following question. I thought that Canonical basis is just another word for the Standard basis. Hope you people could clarify the difference between these two in the given context. :) Question: Find the...

Homework Statement There are a set number of marbles in a bag; the marbles consist of two colors. We are given the mean number of marbles of color 1 in the bag, as well as color 1's standard deviation. We are then asked to find the mean and standard deviation of color 2.Homework Equations How...

I am using NiSO4 aqueous solution, Pt anode, Cu cathode coated with Au for Ni electroplating (at 3 V DC) on Au. Cu is not exposed to solution. To calculate cell potential should I consider Cu/Pt or Au/Pt. If I replace Pt with graphite, whether for same 3 V DC supply Ni plating would be...

y dx-4(x+y^6)dy=0 so is it legal to add 4(x+y^6)dy to both sides of the equation? I thought it's bad to add integrands (i.e. dx or dy). Or is it legal to divide both sides of the equation by dx? Would this result in y-4(x+y^6)\frac{dy}{dx}=0 or y-\frac{4(x+y^6)}{dx}\frac{dy}{dx}=0

Homework Statement 1) Which U(1), SU(2) and SU(3) gauge invariances are implemented in nature according to the Standard Model? What are the related quantum numbers? 2) The SU(2) symmetry is referred to as a non-abelian symmetry. What does this imply for the interactions between the force...

Homework Statement "Estimate the standard reaction Gibbs energy of the following reaction: N2 + 3 H2 ‒‒> 2 NH3 at 100K and at 1000K." Homework Equations ΔS(T2) = S°(T1) + ∫ n Cp dT/T ΔG = ΔH ‒ TΔS Given data: http://imgur.com/MBakUEB (may need to right-click and select...

Find the standard form of the equation of the parabola with the given characteristics and vertex at the origin. Passes through the point (-5, 1/8); vertical axis. I know that there is no focus of the parabola or equation given for this problem, so how would I solve this problem? Is the correct...

Find the standard form of the equation of the parabola with the given characteristics and vertex at the origin. Passes through the point (-1, 1/8); vertical axis. I know that there is no focus of the parabola or equation given for this problem, so how would I solve this problem? Is the correct...

how do you write a polynomial in three variables say x,y,z in standard form?

Hi all, This is my first post here. As a bit of background I have a keen interest in mathematics, but I'm not necessarily strong in it... Today I was working with a dataset that models difference in elevation values (dH) over time (x). I have approximately 20 samples, of which each dH value...

lim x->o sin(nx)/x = n for n E real numbers i haven't seen it in any books but it works.

guys, there are two users in my system which are 'standard user' and no one is 'administrator'. now the problem is that when i am installing any software then it's asking to type an administrator password and then press 'yes'. but there is no blank to type any password and the yes option is...

ΔG° is the measure of Gibbs Free energy change at 1 bar but no specified temperature and also the stoichiometric amounts depending on the equation of the chemical reaction. For example, if X ->2Y then the ΔG° would be equal to ΔG°f(2Y)-ΔG°f(X). While for ΔG it is a general term for Gibbs Free...

This is for my Chemical Engineering class, but it comes down to a thermodynamics question. I need to calculate the gibbs free energy for a few reactions, problem is some of the compounds (1-Buten-3-yne and Styrene) do not have standard entropy values that I can find. Without a standard entropy I...

In standard electrodes, why it is necessary to maintain the pressure as 1 atmosphere, is the potential of an half cell depends on pressure too? If yes then how the potential of an half cell depends upon pressure? Say for example, i know that in standard hydrogen electrodes we maintain the...

Homework Statement People drink on average, 78L of beer per year with a standard deviation of 25L. at least what percentage of people would drink between 20 and 136L per year? The Attempt at a Solution I found the z-scores of both and they came up to be +/- 2.32. Compared these values to the...

For example, if were given only a vector <5, 3, 1>, is this assumed to be respect with the standard basis of R^3? And would this mean that any nonstandard basis is with respect to a standard basis?

Homework Statement 3 randomly selected observations form the standard normal distribution are selected. What is the probability that their sum is less than 2? Homework Equations The Attempt at a Solution I know that the answer is 0.874928, but I don't know how to get that...

so for (a) (i) I used $\frac{x-\mu}{\sigma}=z $\dfrac{0.70-0.76}{0.06}=-1 = a $ and $\frac{0.79-0.76}{0.06}=.5 = b$ ii $P(.70<X)$ z-table for $-1$ is $0.3413$ so $0.3413 + .500 = 0.8413$ $P(.70<X<.79)$ z-table for $.5$ is $0.1915$ so $0.3413+0.1915=0.5328$

As usual, the interpretation is still unclear, but I think it is an interesting effect. LHCb studied the angular distributions in the decay ##B^0 \to K* \mu \mu## and presented the result at EPS2013. In one variable (called P'5) in two bins, a large deviation was found (3.7 sigma in one bin)...

Homework Statement (Page 222 number 5) A highway department has enough salt to handle a total of 80 inches of snowfall. Suppose the daily amount of snow has a mean of 1.5 inches and a standard deviation of .3 inches. Approximate the probability that the salt on hand will suffice for...

Homework Statement Determine what redox reaction, if any, occurs (at 25° C) when lead metal (Pb) is added to 1.0-M solution of NiCl2 Homework Equations Ecell = Ecathode- Eanode Here is standard reduction potentials given for Pb and Cl Pb2+(aq) + 2e- → Pb(s) E°(V) = -0.13 Cl2(g) 2e-...

in HEP research and lit, is it common to think and write about the masses of the various leptons and quarks as relative to the invariant mass of some chosen standard particle? such as the electron? or something else?

Homework Statement Showing all your working, calculate the arithmetic mean and standard deviation of the number of days lost. Table shows man days lost to sickness.. Days lost: 1-3 4-6 7-9 10-12 13-15 Frequency 8 7 10 9 6 Homework Equations...

So I have to do an induction but I am not quite sure how to set it up. I have already proven that at each step I have either my intended result or I can advance one more step. I have also proven that there are a finite number of steps. Intuitively I have essentially completed the proof. I...

I posted this question in an another forum but I didn't receive any answers, so I'll post it here again: Do all the fundamental particles in the Standard Model (61 fundamental particles) exhibit wave-particle duality? From my understanding, a photon acts more like a wave than it does a...

Hi, I read in a textbook that area Moment of Inertia (M.I.) of any shape would be Ʃ of (y2 χ A)1,2...n where, A represents the Area of strip no. 1, 2... n y is the distance between globlal centre of gravity (C.G.) of the shape to th local C.G. of strip no. 1, 2... n (pl. look at the image)...

I have a one-dimensional set of data which I have attached an image of. This data is an intensity z, as a function of time, t. There are many data points over time with a large amount of scatter. However, if the data is binned over very short wavelengths we see that there is smooth variation...

Sorry for my English. I write with the help of a translator from google. Please help determine what standards of a graphic symbol electric (number of the standard paragraph, the part number)? In one book in Russia were given 4 image transformer (for drawing in the U.S. and Europe). Аnd did...

We should all know that photons only exist in quantum mechanics. In fact, the idea that energy comes bundled in discrete units is what actually caused QM in the first place. For some reason, however, I've spent my entire life under the assumption that cosmologists make true statements about...

Hello, I've been trying to find online where I could calculate my grade based off a college curve. So the average grade on the test was a 63. The RMS is 16. I got a 86. So what will my grade curve to? This is out of 50 people. Also, the professor curves to a 70 (I think).

what changes does there occur in the result of the gaussian distribution "integration e^-alpha*x^2 dx=sqrt(pi/alpha) if i substitute that x^2 with some (x-a)^2? then what should be the integral result ?

I am measuring the thickness of many identically prepared objects. In order to obtain the most accurate value, I measure each object multiple times, in different locations, and average these values to get the average thickness of that object, along with the standard deviation. But I am really...

Three related questions on which I could use some help: a] In another thread, Bill_k posted something like: "Electrons, being charged, could exchange energy by exchanging a virtual photon." ok, yet I thought electrons usually interacted via the EM field ['real' photons]... So how...

I was wondering if anyone could help me with calculating the standard deviation of the standard deviation. What I mean by this is say for example I roll a dice 100 times and then calculate the mean and standard deviation from the results I collected. The results are not going to be exact because...

Say we want to saw ten planks and we have two methods available - one is sawing them all at once, ensuring they're all exactly uniform length. The other method is sawing them individually. Either method has EV of 1m and a standard deviation of 0.005m. I want to find the standard deviation of...

http://arxiv.org/abs/1304.8050 Beyond the Spectral Standard Model: Emergence of Pati-Salam Unification Ali H. Chamseddine, Alain Connes, Walter D. van Suijlekom (Submitted on 30 Apr 2013) I have a few questions about this paper... How good is "almost uniquely"? i.e. it would be good to see...

Let $A$ be any set. Show that there is no bijection between $A$ and the power set $\mathcal P(A)$ of $A$. (The power set of a set is the set of all its subsets including the empty-set.)

Homework Statement Hi all, I have a question about a standard flat key being specified to prevent failure. I'm just quickly giving a problem description because once I understand what's going on I can easily run calculations but I'm missing something fundamental. Essentially the problem I...

Hi, can someone please explain to me how I can identify which is the oxidation half and which is the reduction half of a redox reaction. I have read on the internet that the oxidation half is the highest up the table between the two then why doesn't it work for: (Ca^2+) + 2Br → Ca + Br2...

Homework Statement I'm trying to convert something like 1.25^-03 into it's standard number composed of standard decimals using a calculator (0.0125) - if you know what I mean. Thanks.

So one can even have "beyond standard Thermodynamics" :biggrin: I just came across this and it seems interesting. http://arxiv.org/abs/1207.0434 Laws of thermodynamics beyond the von Neumann regime Dario Egloff, Oscar C. O. Dahlsten, Renato Renner, Vlatko Vedral (Submitted on 2 Jul 2012)...

Q) A solid non-conducting sphere of radius R carries non-uniform charge distribution with charge density ρ = ρs(r/R), where ρs is a constant. Show that (a) the total charge on the sphere is Q = ∏ρsR3, and (b) find the electric field inside the sphere. Now first part (a) is fairly easy, assumed...