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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: 30,330
09-30-2005, 09:44 AM
1. The Gamblers Fallacy and Regression to the Mean

Hi, so first time posting and all. I'm not a statistician by degree or trade (actually an engineer), so a little confused by something, and was...

• Replies: 5
• Views: 9,347
10-10-2013, 02:27 PM
2. Complex probability relating to NYC taxi cabs

There are 13,000 taxi cabs in New York City. Let's say I have taken 600 rides (each one in a random cab). What are the chances that I have...

• Replies: 5
• Views: 2,322
12-30-2013, 10:21 AM
3. Probability of deviation in sample proportion

Hi! I’m very new to statistics and I’m stuck on what formula to use for an assignment. I have the information that 32.19 % of my population is...

• Replies: 5
• Views: 1,819
10-19-2013, 01:49 PM
4. How to find the probability of a podium finish

Say in a race there are 22 competitors and say that the probability of driver A of winning the race is 55%. How can one calculate the probability of...

• Replies: 5
• Views: 2,190
10-08-2013, 10:57 PM
5. Probability and standard deviation

Dear Members, I am struggling with this particular problem and I am not sure about my answers. If anybody could verify them that would be of great...

• Replies: 5
• Views: 4,234
11-25-2013, 12:10 AM
6. Coin Toss

Hi, There are three people, A, B ,C, tossing a coin. The first one to get heads wins, they toss in succession in the order ABC, show the...

• Replies: 5
• Views: 2,339
plm
11-17-2013, 11:54 AM
7. Amateur has a question please

My wife and I have been married for 30 years. During all this time neither my wife, nor her father (my father-in-law), have had an auto accident. We...

• Replies: 5
• Views: 1,929
11-02-2013, 08:54 PM
8. (Simple) proof for the arithmetic mean?

Hello. I am having trouble trying to figure out a way to answer this homework exercise: "Prove that the arithmetic mean cannot be greater than the...

• Replies: 5
• Views: 2,129
02-05-2014, 03:48 PM
9. Number of trials in zero-sum game

Hi all, this is my first post here! Forgive me if it's not in the right place. I have a question that's been bugging me because I tend to be...

• Replies: 5
• Views: 2,029
03-14-2014, 08:20 AM
10. Probability question

I need a probability question answering as soon as possible and i though this might be the place to come. There are 13 balls in a hat being...

• Replies: 5
• Views: 1,894
03-02-2014, 11:36 PM
11. Coin Flip and calling randomly

If there is a coin flip contest and there is a coin flipper continuously flipping the coin and there are three contestants 1. Always Calls Heads...

• Replies: 5
• Views: 1,605
03-10-2014, 08:47 AM
12. First stats course. need help with this problem

a tree stand has 12 douglas firs, 10 maples, 3 hemlocks, and 7 cedars. if you randomly select 6 trees, what is the probability that at least 2 of...

• Replies: 5
• Views: 2,268
03-11-2014, 02:10 PM
13. A probability question

Dear all This may be simple for you guys but I would be grateful for some advice on the following: A bus stop layby is only long enough for 2...

• Replies: 5
• Views: 1,599
BGM
04-09-2014, 07:50 AM
14. Conditional Probability?

What is the probability on a single roll of a pair of dice, that the sum is 6, given that at least one die came up 1? I'm thinking that there are...

• Replies: 5
• Views: 1,680
04-12-2014, 11:20 PM
15. Probability of a sequence....

HI Folks, New to the forum. It's nice to find a forum in this area. I hope someone can help me out. My goal is to determine if it is possible to...

• Replies: 5
• Views: 2,488
07-12-2014, 06:41 PM
16. Logistic Regression Problem

Hi! My collegue is developing a logistic regression to predict the probability of a customer taking up a particular credit card. Let's call...

• Replies: 5
• Views: 2,233
07-28-2014, 09:57 AM
17. Probability that Bernoulli p-parameter is greater than some value, given N samples?

Hello everybody, I have the following question. Assume I observe N outcomes from a Bernoulli random variable with unknown success parameter p....

• Replies: 5
• Views: 2,348
08-14-2014, 01:52 PM
18. probability poisson distributed

hi can somebody help me with this question please.

• Replies: 5
• Views: 2,161
09-01-2014, 10:25 AM

kindly help (or provide hints) on below question: Suppose that you pay $1024 to enter a coin tossing game. A biased coin with head probability... • Replies: 5 • Views: 2,397 BGM 10-16-2014, 12:48 AM 20. Secret santa problem Hi everybody At my work we just started a secret santa game. We are 6 and we ended up getting an outsider to mix 6 pieces of paper, each with one... • Replies: 5 • Views: 2,253 11-28-2014, 06:26 PM 21. Computing MLE estimate So I have so i'm stuck at taking the log :mad: can somoene help me ? • Replies: 5 • Views: 2,195 01-06-2015, 01:17 PM 22. Confidence Intervals Hi I am new to stats and really spending lots of time on concepts which I can build on, I thought I was fairly comfortable with confidence... • Replies: 5 • Views: 2,559 12-19-2014, 03:12 AM 23. Calculating Sensitivity and Specificity of Combined Testing...With a Surprise. Ok guys. I have an interesting question. I'm a biomedical engineering student from Georgia Tech and for one of my classes I have to implement... • Replies: 5 • Views: 1,554 02-03-2015, 09:35 AM 24. Stuck with a (i think) simple problem Hi everybody, I have a question here that I'm completely brain frozen with.. (I'm not the youngest anymore, and I can't seem to wrap my brain around... • Replies: 5 • Views: 1,855 02-05-2015, 01:39 PM 25. Binomial Distribution Question Hey guys, I have a bit of trouble understanding this binomial distribution question According to the call center statistics of a company, on... • Replies: 5 • Views: 1,879 03-05-2015, 10:43 AM 26. Thumbs Up or Down on my logic Very rusty on my statistics and will appreciate validation or correction on my thinking. "Fair" playing field - 88 players (18 in red shirts, 70... • Replies: 5 • Views: 1,547 BGM 03-21-2015, 02:30 PM 27. Exercises with answers Hello probabilitygeniuses I am very new to probabilities and would like to ask if there are online resources with loads of probability... • Replies: 5 • Views: 2,416 04-26-2015, 09:29 AM 28. probability of 8 successes out of 256 events Hi all hope you are well, i was trying to calculate what the probability of getting exactly 8 successes in 256 events. I used a Binomial on line... • Replies: 5 • Views: 1,511 05-25-2015, 06:12 AM 29. Newbie here, would appreciate some help. Hey guys. First post here and it's a bit basic so sorry about that. I have created an analogy to the problem I have. Say I have 8 balls, 4 of... • Replies: 5 • Views: 1,991 08-27-2015, 02:15 PM 30. Determine distribution and parameters I have a question but maybe it's the wrong question so I'll state the task first... I want to make data that looks like the data I'm working with... • Replies: 5 • Views: 1,598 09-21-2015, 09:13 PM 31. Conditional Probability http://i.imgur.com/9UELFY5.png Here is the problem in question. I have the answers for both of these already,but I am not sure I have 2b correct. ... • Replies: 5 • Views: 1,198 12-14-2015, 05:18 PM 32. Assistance with Monte Carlo Method for Board GAme Outcomes 16 cards. The cards have up to four values. I need assistance building a data set I can analyze. Simulating a starting hand, and... • Replies: 5 • Views: 1,898 01-27-2016, 06:58 PM 33. Best To Draw First Or Last? Hi, newbie non mathematician looking for an answer to a long debated question in angling. When fishing a competition we draw a random number (say... • Replies: 5 • Views: 2,006 01-20-2016, 01:46 PM 34. How to calculate the odds that Team A will beat Team B given their records to date? I would like to find a formula to calculate the probability that Team A will beat Team B taking into account just their records to date. For... • Replies: 5 • Views: 3,511 02-23-2016, 02:16 PM 35. Probability question Let's say we have 60 balls of which 17 are red and the rest black. If I pick 7 balls at random, what is the probability that i picked at least 3 red... • Replies: 5 • Views: 1,394 02-25-2016, 02:32 PM 36. Probability of opposite of mean I am trying to calculate the probability of reverse preferences for an outcome. I have the mean and standard deviation of the predicted outcome, how... • Replies: 5 • Views: 1,889 03-03-2016, 07:12 AM 37. Manufacturing machine probability problem There are three possible environment conditions: normal, rainy and hot. Rainy and hot days may be risky to a system that has been deployed, but... • Replies: 5 • Views: 3,262 03-06-2016, 02:29 AM 38. Paper Notes in a Bag Hello all, I have this problem, which I am not fully sure how to solve: In a bag there are 18 paper notes. On five of them there is the digit... • Replies: 5 • Views: 1,347 06-15-2016, 06:47 AM 39. Calculating Probabilities If a mechanical fault in a car occurs once in every 120 days, and I drive the car 260 days per year, what is the probability of a mechanical fault... • Replies: 5 • Views: 1,120 07-20-2016, 12:59 PM 40. Probability of an attribute in one member of a population Wondering whether the following can be calculated (or whether more info is needed). Here's the population: A - 224,000,000 (72.5%) B - ... • Replies: 5 • Views: 2,231 09-28-2016, 04:03 PM 41. Help please on calculating probabilities of certain coin-flip outcomes Hi all, (Note: this is not a request for help with "homework"; I'm 51 years old and am trying to learn on my own, through my own "assignments" to... • Replies: 5 • Views: 1,185 04-28-2017, 06:10 PM 42. Union and intersection 43% of adults are stockholders. 75% of adult stockholders have some college education. 37% of adults have some college education. An adult is... • Replies: 5 • Views: 1,950 03-18-2017, 06:05 PM 43. Probability of developing a lung cancer disease I need to solve this problem: A cohort study is done to assess the impact of smoking on lung cancer. In this study, a large representative sample... • Replies: 5 • Views: 2,073 03-01-2017, 06:30 PM 44. Bayesian exercise -2 down vote favorite I cant get my head round the following exercise: You are testing dice for a casino to make sure that sixes do not come up... • Replies: 5 • Views: 3,175 01-18-2017, 01:56 PM 45. MGF of sample mean of IID poisson RVs I am given the MGF of IID RVs as e^{\lambda(e^t-1)} and am supposed to find the MGF of their sample mean of n such RVs. I have am arriving at ... • Replies: 5 • Views: 2,752 02-14-2017, 08:26 PM 46. Help with Confidence Intervals The questions regarding confidence intervals and population means are hard to understand: Please help me set them up in a formula and solve. #3 ... • Replies: 4 • Views: 6,327 09-26-2005, 10:01 AM 47. I need help please!!! A mail order company receives an average of five orders per 500 solicitations. If it sends out 100 advertisements, find the probability of receiving... • Replies: 4 • Views: 9,978 10-09-2005, 08:51 PM 48. can you help with this as well!? Suppose that 20% of all subscribers to a business magazine earn an income greater than$100,000. If the magazine takes a random sample of 20...

• Replies: 4
• Views: 3,230
11-03-2005, 03:15 PM
49. in the movies

can someone help me!!!!! i've been stuck in this problem for hours now!!! ack!!!! heeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeelp meeeeeeeeeeeeeeeeeeeeeeee...

• Replies: 4
• Views: 3,806
11-11-2005, 04:53 PM
50. Hi I need help w/ sampling distribution.

HI, I'm taking statistics and i was trying to solve a problem, but I couldn't solve it. I was wondering if you could help me out. Here's the...

• Replies: 4
• Views: 4,605
11-11-2005, 07:49 PM
51. Help!

I'm working on this problem and I am completely lost. There there anyone out there that can help me. I see the problem worked out in the book, but...

• Replies: 4
• Views: 3,582
12-02-2005, 03:49 PM
52. Help with normal distribution! (please!)

Hi, I'm looking through some past papers for an exam I have this weekend and have come across this strange binomial distribution question, that's...

• Replies: 4
• Views: 3,620
12-06-2005, 03:00 PM
53. Probability question

Here is the problem: To get to work, a commuter must cross train tracks. The time the train arrives varies slightly from day to day , but the...

• Replies: 4
• Views: 9,633
12-15-2005, 11:13 AM
54. Am I on the right track for this one?

The height of people in a certain population is approx. normally distributed with a mean of 67 inches and a standard deviation of 3.4 inches....

• Replies: 4
• Views: 2,741
02-08-2006, 12:59 AM
55. Bidding question - (Uniform Probability Distribution)

Suppose you are interested in bidding on a piece of land and we know one other bidder is interested. The seller announced that the highest bid in...

• Replies: 4
• Views: 19,074
02-14-2006, 12:26 PM

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