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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 30,255
09-30-2005, 09:44 AM
1. ### Puzzling problem

King Zack's kingdom is on the brink of war with the neighboring kingdom of Yarmouth. King Zack has three advisors, Alfred, Belle, and Chris. ...

• Replies: 3
• Views: 1,512
03-12-2012, 01:48 PM
2. ### Coin and die probability

If I repeatedly and alternately toss a coin and roll a 6 sided die beginning with the coin what is probability of getting a head before a 6

• Replies: 6
• Views: 1,507
BGM
02-16-2016, 01:38 PM
3. ### Real World Problem--Defending Your Gambling Losses

I'm a slot player, bet the maximum on dollar machines (\$40 is a typical bet). Over the period of a year I've had large wins of say, \$4000, \$14,000,...

• Replies: 0
• Views: 2,415
08-07-2009, 12:15 AM
4. ### How is it possible to account for lucky guesses?

I need to solve a problem involving assessing the ability of prospective film analysts to make accurate predictions of the total U.S. box office...

• Replies: 0
• Views: 3,207
06-21-2007, 05:21 PM
5. ### Need Help with this probability question

Hi everyone, i am new to the forum. So I was never really good at probability, which is why I am posting here to see if I did these questions...

• Replies: 6
• Views: 1,807
10-20-2012, 08:50 PM

So my teacher gave us practice questions for a test review and i dont understand these questions at ALL. Can someone please explain how to do...

• Replies: 0
• Views: 1,369
Biz
10-21-2012, 07:17 PM
7. ### Conditional expectation

Good afternoon, I have to calculate the expected value of a logistic distribution given that the values are above a given constant (lets say 0). So...

• Replies: 1
• Views: 3,957
BGM
06-14-2012, 04:58 PM
8. ### Stats question.

Part 1. In how many ways can a television director schedule a sponsor's six different commercials during the six time slots allocated to commercials...

• Replies: 1
• Views: 3,085
07-23-2008, 07:37 PM
9. ### stuck on a probability problem

THe question is according to the January theory if the stock market is up in Jan. it will be up all year, if its down it will be down all year....

• Replies: 0
• Views: 2,431
09-26-2009, 05:46 PM
10. ### Homework help with Confidence Intervals & Estimating Probability Proportions?

I'm super lost on a few sets of my statistics homework and wondering if anyone can walk me through this so I can finish the rest of the questions as...

• Replies: 2
• Views: 4,180
11-24-2014, 02:46 PM
11. ### consectutive wins in 10,000 events

Hello, Thanks in advance for your help. My question is related to probability. I think I know the answer, but I would like confirmation on my...

• Replies: 1
• Views: 2,389
08-13-2007, 03:40 PM
12. ### Probability Q help, uses combinatorics, Poisson-Distr and possibly Multinomal

Place successively and independent of each other 20 particles into 10 boxes. Hereby, each of the 10 boxes is chosen with the same probability. a)...

• Replies: 0
• Views: 2,191
bkc
12-10-2016, 03:05 PM
13. ### Variance and correlation coefficient

Nothing to see here :)

• Replies: 1
• Views: 2,224
11-24-2006, 12:15 PM
14. ### help with binomial distribution

Hello, I have a problem with this binomial question..I will try to make it short a machine makes on average 1 error per hour and needs to be...

• Replies: 0
• Views: 1,379
06-01-2012, 04:28 PM
15. ### Combinatorial Analysis HW Help

There are 100 U.S Senators, two from each of the 50 States. If 12 Senators are randomly chosen to form a committee, what is the probabilty that...

• Replies: 0
• Views: 1,514
02-08-2015, 12:36 AM

Hi guys, I have no idea how to solve this problem...can anyone give me some piece of advice. (please..) If the probability density of X is...

• Replies: 1
• Views: 2,043
10-18-2008, 09:07 AM
17. ### Very easy question for you...help

Assume that the rate of return on projects is a random variable having a normal distribution with standard deviation = 0.05 per cent. If a bank...

• Replies: 6
• Views: 2,851
10-20-2008, 11:10 AM
18. ### Poisson distribution...have you any ideas?

While away from the office for an hour, a lecturer receives an average of six telephone calls. i)What conditions must be satisfied if the number...

• Replies: 1
• Views: 1,936
10-20-2008, 11:45 AM
19. ### Uniform and Independent Probability (Simple Problem)

Hey there, I have a quick question. The problem: 3 numbers, say X, Y, and Z are chosen from a set of numbers (1 to n) where n is greater or...

• Replies: 7
• Views: 3,319
10-12-2011, 08:17 AM
20. ### Expected values, MGF

I got a couple of exercise questions that a little help would be appreciated. 1.Suppose X and Y discrete RV with following joint PF: Y/X...

• Replies: 3
• Views: 3,081
05-27-2009, 11:27 PM
21. ### Scrabble probability question?

I have a question for you probability and statistics experts out there. At the beginning of scrabble to determine who starts, each person (in this...

• Replies: 4
• Views: 9,124
12-21-2007, 04:22 PM
22. ### Probability calculation problem for a ranked set sample

Let us consider a case where a ranked set sampling scheme from \$n^2\$ subjects has been adopted. There are a total of \$n\$ RSS blocks. So each RSS...

• Replies: 1
• Views: 2,325
BGM
03-23-2013, 01:53 PM
23. ### Conditional probability of an event given two independent events

I am dealing with an interesting probability problem. I had 16 subjects randomly divided into 4 different rooms, each room having 4 seats. The...

• Replies: 2
• Views: 1,877
01-20-2015, 08:14 AM
24. ### scrabble probability =]

if im the first to draw all 7 SCRABBLE tiles what is the probabiltiy ill get an X and J? another question: what is the probabilty ill get...

• Replies: 1
• Views: 4,939
05-14-2008, 09:05 PM
25. ### Is this problem even possible to solve?

"Last year 75% of Joe Shack's cash purchases were for less than \$150. In a random sample of 200 cash processing companies, what is the probability of...

• Replies: 2
• Views: 2,662
03-15-2011, 12:30 AM
26. ### I choose a 4 digit number abcd between 0000 and 9999 at random.

I choose a 4 digit number abcd between 0000 and 9999 at random. What is the probability that? a) What is the probability that |a-d| = 2? b) What...

• Replies: 2
• Views: 3,212
01-11-2013, 10:58 PM
27. ### Exponentially Distributed Random Variable

Hey everyone, im having a hard time with this questions, I guess its just not clicking. I was wondering if someone could give me some pointers. ...

• Replies: 1
• Views: 4,359
07-20-2007, 07:11 AM
28. ### Expected Value of the Difference

The heights of all male students in a university have mean 170 cm and standard deviation 10 cm. Two male students are randomly selected. What is...

• Replies: 3
• Views: 8,842
10-20-2010, 03:31 PM
29. ### Probability of event vs. (?) probability of event occurring by chance

Hi there: This is my first post so please forgive me if I am in the wrong section. This is not technically "homework", but it is a question that I...

• Replies: 6
• Views: 2,711
05-17-2013, 05:29 PM
30. ### Comparing proportions

Hello there: I have a couple of questions about comparing proportions. 1) why do we use a z-test to compare proportions but t-test to compare...

• Replies: 0
• Views: 1,028
09-21-2014, 01:35 PM
31. ### Support of a Distribution?

Does the support of a distribution change? For example lets say Y~Beta(20,30) the support is from 0 to . However what would the support be for 3Y+2?...

• Replies: 2
• Views: 1,296
02-14-2016, 05:33 PM
32. ### Plase! I need urgent Help, MLE

hello i'm really stucked with this problem. hope anybody oould help me out. Thanks!!

• Replies: 1
• Views: 2,476
10-11-2010, 11:44 PM
33. ### Acceptance Testing - Calculating Type 1 and Type 2 Errors

Removed...

• Replies: 1
• Views: 1,564
01-27-2015, 11:25 AM
34. ### Joint Probability Question

I was wondering if anyone knows how to do this: Five balls are drawn without replacement from an urn that contains 7 blue balls, 4 green balls and...

• Replies: 1
• Views: 2,910
03-19-2009, 02:01 PM
35. ### Help with conditional probabilty

I've been struggling for a good couple hours on the below, and I was hoping someone might be able to push me in the right direction... "A"...

• Replies: 2
• Views: 2,674
11-14-2009, 03:55 PM
36. ### Joint density function and conditional distribution

Need help for my assignment question. I just can't get the answer for this question after hours of trying. Given the joint density function ...

• Replies: 2
• Views: 7,004
06-01-2009, 01:58 AM
37. ### Is this a suitable way to summarize parameter distributions?

Hello everyone, I have the following situation: I have a set of multiple environmental models with multiple parameters. I have now run these with...

• Replies: 0
• Views: 972
12-07-2012, 01:34 PM
38. ### collect sales taxes on items purchased through the internet

Many states are carefully considering steps that would help them collect sales taxes on items purchased through the internet. How many randomly...

• Replies: 0
• Views: 5,421
12-06-2007, 03:58 PM
39. ### Probability - mean, and deviation

A scale designed so that when items are weighed, the errors in the indicated weights are normally distributed with a mean 0g and a standard deviation...

• Replies: 0
• Views: 3,553
12-06-2007, 04:07 PM
40. ### random problems

I get extremely confused about how to solve these problems. I don't even have examples to go by. For instance: In how many different ways can...

• Replies: 1
• Views: 2,113
10-02-2006, 02:24 AM
41. ### Magician

A magician has cards 1-10 and a person picks two numbers. What is the probability that Sebastian will correctly name the 2 cards, if he is just...

• Replies: 1
• Views: 1,752
BGM
10-23-2009, 10:31 AM
42. ### Erlang-k where k is Negative Binomial

I have a stochastic process where calls have exponential interarrival times with parameter L and I have a stationary probability, p, that a call is...

• Replies: 0
• Views: 2,654
08-28-2007, 10:35 AM
43. ### Weighted coin probability

The problem: A coin is weighted to show heads 60% of the time. How many coin tosses are needed to have 90% confidence of getting more heads than...

• Replies: 5
• Views: 5,472
BGM
06-06-2011, 03:18 PM
44. ### Poisson Approximation

A sequence of N triples of balls are randomly and independently placed into one of 100 boxes. Each triple of balls consists of a red, white and blue...

• Replies: 2
• Views: 1,755
12-09-2011, 09:03 AM
45. ### probability help...poisson process

hi there can any one explain and show me how this is done please , i have a book at home and there are lots of unexplained questions . During...

• Replies: 1
• Views: 2,253
BGM
03-23-2011, 04:28 PM
46. ### Fair bet question

This is the question: Your friend proposes the following game. She will roll a fair dice six times. If the number of different numbers that show...

• Replies: 2
• Views: 2,019
04-02-2013, 04:41 AM
47. ### Moments of a random variable involving numerous Binomial Distributions

I am editing my post because it might have been unclear. Suppose X is a random variable involving 4 binomially distributed random variables: X...

• Replies: 6
• Views: 1,369
05-10-2016, 10:59 AM
48. ### Probability based on multiple pieces of information

It's been about 20 year since my last stats class and I'm working on a fun little side project that involves some probability. I'm having some...

• Replies: 9
• Views: 1,833
07-22-2014, 12:57 PM
49. ### how to understand this probability

Suppose there is a conditional probability density function p(x, pi| fi) which is called complete likelihood. This is a conditional joint...

• Replies: 0
• Views: 2,355
06-22-2009, 07:02 PM
50. ### Inequalities between random variables

Hi guys, I have the following question: Assuming that X and Y are two independent discrete random variables and Pr(X <= Y) is known how easily...

• Replies: 2
• Views: 2,356
09-15-2012, 02:11 AM
51. ### Simulate and sample from a group

I'm confused with a question as follows: Consider the case that the total number of accidents happening in a highway in one day follows the...

• Replies: 0
• Views: 986
03-14-2015, 05:48 AM
52. ### please i need help with this probleme

hi,we got this mind breaking exercice from our probability teacher -.- note:it's question number 2 that's killing me a gate keeper have 12 keys and...

• Replies: 1
• Views: 1,353
BGM
01-02-2013, 01:36 PM
53. ### determining the most probable permutation of a set

Is there any way to determine the most probable permutation of any given set? For example, given the set of letters SKTANH, is there a way to compute...

• Replies: 2
• Views: 157
09-30-2017, 02:37 PM
54. ### Cup and ball game: what are the odds of that?

OK we are having an intelectual discussion (no, really) about the change in odds during the classic cup and ball game. To explain: a dealer has...

• Replies: 2
• Views: 12,567
02-22-2010, 08:00 PM
55. ### Stats homework help NYS

New York Stock Exchange. Suppose that the percentage returns for a given year for all Stocks listed on the New York Stock Exchange follows a...

• Replies: 0
• Views: 1,272
10-22-2014, 02:20 PM

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