Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:25 AM
micromass

1 
27,683 
An internet service provider uses 50 modems to serve the needs of 1000 customers. It is estimated that at a given...

Aug1808 09:12 PM
CRGreathouse

1 
1,232 
I've been wondering about a simple question that I can't just google and get the answer to. Usually when we calculate...

T 03:41 PM
Hornbein

3 
152 
Hey guys thought this was an interesting problem that our lecturer purposed:
Pick any word in the first few lines...

Sep1209 01:35 AM
xplosiv

10 
3,081 
Hello,
I am trying to get the hang of Probability Generating Functions, but I don't quite understand them fully.
...

Oct1610 12:13 PM
EthanW

2 
1,246 
For any integer valued RV X Summation n=0 to infinity of s^n P(X=<n) = (1s)^1 * Summation k=0 to infinity of...

Nov312 06:04 PM
mfb

1 
568 
ok I hope nobody gets mad at me for asking about this but here goes:
So I've recently become pretty interested in...

Aug708 09:15 AM
Focus

3 
5,758 
I need help with finding the probability of the following game, I am making game for my data management class. The...

Jan1911 07:42 AM
micromass

4 
1,226 
The function fx(x) is defined differently for the range 0 to 1 as for values greater than one to 2.
Past x = 2, the...

Apr2912 09:52 AM
Stephen Tashi

1 
833 
I understand a probability function can be defined according to range ?
So for example,
0>x f(x) = 0
for...

Mar2712 04:30 AM
chiro

3 
1,120 
Joe thinks that no more than 20% of students in his statistics class will get an A in the final examination. To prove...

Apr3005 09:48 PM
BicycleTree

7 
1,014 
I was wondering, what is the estimated frequency for the most frequent number in lottery draws? Of course, I don't...

Oct2309 10:09 PM
bpet

10 
8,857 
Hello
I am having a hard time understanding which factors should be taken into account and which ones should not be...

Feb2714 03:10 PM
MarneMath

1 
193 
The question: A baseball player has a 5% chance to hit a homerun each at bat. If the player is up 4 times, what is...

Aug1504 04:01 PM
robert Ihnot

4 
29,821 
There is a dice where probability of obtaining a number is proportional to the number itself.
I have done these...

Apr3012 01:42 PM
ssd

2 
895 
On a multiple guess exam, there are 3 possible answers for each of the 5 questions. What is the probability that the...

Feb2408 02:21 PM
Somefantastik

4 
1,715 
Let X1,...,Xn be independent, identically distributed random variables with exponential distribution of parameter λ....

Mar2311 12:46 PM
statdad

4 
1,842 
Hello,
I am trying to solve the following problem from Sethna's book on statistical mechanics (not homework).
On...

Jul2512 12:09 PM
ENgez

6 
1,309 
A horse race is going to take place with six runners.
The race is over 5 furlongs (1000 meters) and for each of the...

Sep505 11:17 AM
EnumaElish

14 
3,340 
I hope someone can help me understand functions of random variables:
If X~Uniform(A,B), A < X < B
Y~Normal(0,1),...

Oct1704 01:57 PM
TenaliRaman

1 
4,548 
Hi I have a function \phi =arctan(Y/X) where, X\sim \mathcal{N}(A\cos \theta, v) and Y\sim \mathcal{N}(A\sin...

Dec1608 03:43 AM
tinytim

1 
2,165 
The number of hours, N, of daylight at a certain location can be expressed as N(d)=12+6sin(2πd/365) where d=day of the...

Mar2114 02:34 AM
Simon Bridge

1 
201 
If you make an opinion poll over which party people will vote on in a country with seven partys, you get different...

Apr1909 06:11 AM
Mårten

7 
839 
Here is an interesting problem:
You have a pulse, and you know the time average and standard deviation. What is the...

Mar2110 08:46 AM
gcsetma

0 
575 
Hi, I am trying to write a Monte Carlo type simulation. I have a function for the probability (p) of a photon having...

Feb111 10:19 PM
yuiop

3 
794 
I am trying to compare two probability distributions. I tried the chisquare test, but that requires binned data, and...

Sep1705 08:42 AM
EnumaElish

9 
8,759 
Hello All,
I calculated an average latency value let say 3 units
then after observing the network I found that...

Dec211 06:38 PM
Stephen Tashi

3 
1,461 
Throw a dice and record the result. After flipping a fair coin. If it comes letters repeat. If it comes up heads stop....

Mar2413 01:21 PM
ParisSpart

11 
552 
If x is a random variable uniformly continuously distributed on , and y=x^3, then y has the density:
...

Mar2810 03:43 AM
longrob

0 
2,146 
Hello PF! It's been a while. How are things?
In my research I'm faced with determining a probability distribution...

Oct913 12:06 AM
Soveraign

4 
808 
I'm just curious as to how to prove that a Bernoulli distribution probability function is valid (ie. that it is indeed...

Oct809 11:03 AM
bpet

1 
1,221 
I have a problem where there are two resistors in parallel and I need to find the equivalent resistance. R1 = X and R2...

May2805 05:13 PM
OlderDan

4 
3,029 
Hello,
given a continuous random variable x with a known PDF, how can we determine in general the PDF of the...

Feb1111 04:28 AM
chiro

1 
3,039 
given that x has an exponential density function ie p(x) = exp (x) and x(n) & x(m) are statistically independent.
...

Mar3108 09:00 AM
purplebird

3 
2,294 
HI Can anybody tell me how to calculate a PDF of y, where y is a function of x, such that
y = a X*X + bX + C (i.e. a...

Sep2808 08:50 AM
statdad

1 
3,325 
Hello everyone!
I am stuck in my research with a probability density function problem..
I have 'Alpha' which is a...

Oct2011 10:38 PM
Stephen Tashi

25 
4,436 
Hi,
Can someone please check my work if i did the problem correctly? thanks in advance.
Here is the problem:
...

May2105 04:38 PM
mathman

3 
2,101 
Hi Guys,
I am having some trouble trying to solve a probability density function question.
...If the density...

Apr2005 02:08 AM
splitendz

2 
1,913 
if x is a continuous random variable from 1 to 1...how do you find c:
f(x) = c + x , 1 < x < 0
c ...

Oct2507 11:24 AM
HallsofIvy

1 
4,260 
I feel embarassed for asking, but is there a fast way to calculate this without using integration by parts?
\int...

Aug1008 12:28 AM
Focus

2 
1,194 
normally distributed random variable with mean m and variance σ2. Find the PDF of Y

Oct2010 02:51 PM
statdad

1 
910 