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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: 30,353
09-30-2005, 09:44 AM

A recent study indicaed that 82% of US households speak English at home. If 4 households are randomlu selected then.... a. What is the...

• Replies: 2
• Views: 3,011
11-14-2005, 08:32 PM
2. ### probability

ok and also to my last question: The 1 in 1000. So would I take 1/1000=.001 then take .001 * 52 (because people make an avg of 52 purchase/yr.)...

• Replies: 2
• Views: 3,095
11-15-2005, 12:08 PM

Wish I'd found your site a long time ago! I have been working on this all day long with no success and I don't know what to do. I am to...

• Replies: 2
• Views: 5,282
11-15-2005, 12:10 PM
4. ### Probability

Ok I am very new to stats and am very confused. I went to the examples board and now am even more confused. Here is the problem. Ok they offer a...

• Replies: 13
• Views: 5,906
11-15-2005, 03:11 PM
5. ### Need lots of help - Binomial Probabilities

I completely confused on this my problem is this: Richard has just been given a 10 question multiple-choice quiz in his history class. Each...

• Replies: 2
• Views: 13,320
11-16-2005, 10:29 PM
6. ### Poisson distribution

The Poisson Distribution is often used as a model for the number of events occuring within a specific time period. The Poisson probability mass...

• Replies: 0
• Views: 23,468
11-17-2005, 12:25 PM
7. ### need help with set-up

Give the joint density f(x,y)= 60xy^2 if 0<x<y<1 and 0 otherwise, find P(X+Y<1). I just need help setting up the integral...I don't know what to...

• Replies: 1
• Views: 4,384
11-20-2005, 06:31 PM
8. ### problem with all laws...

I have to pass a test on-line, but I really don't get it. I need to pass it at least 3 times without mistakes (knowing it does change every time i...

• Replies: 3
• Views: 4,758
11-22-2005, 03:47 PM
9. ### expectation of sums of random variables

Hi I am having trouble solving a homework problem. It says: N people arrive separately to a profeesional dinner. Upon arrival each person looks...

• Replies: 1
• Views: 6,853
11-23-2005, 11:59 AM
10. ### Central Limit Theory?

Hi everyone! Here's my problem: In a large population, 12.5% of all individuals have diabetes. (a) Seven of these individuals are sampled at...

• Replies: 7
• Views: 3,896
11-28-2005, 11:35 PM
11. ### Uniform Distribution/Probability Density Function

I'm experiencing a mental block with this concept. If anyone could help me out, I'd be most appreciative. I understand the formula for the...

• Replies: 3
• Views: 9,941
11-29-2005, 09:29 PM
12. ### Probability of intersection

Hello, Does anyone know if the probability of intersection of A and B can be BIGGER than the multiplication of the probability of A with the...

• Replies: 1
• Views: 6,139
11-30-2005, 09:13 AM
13. ### probability

This is a part of a problem. I decided to ask it here after hours of trying to solve it... Two tennis players make a match composed of 5 sets....

• Replies: 17
• Views: 7,550
11-30-2005, 04:49 PM
14. ### 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: 3,584
12-02-2005, 03:49 PM
15. ### 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: 3,622
12-06-2005, 03:00 PM
16. ### Probability question (league related)

I have a question that I figured I post to see some other people opinions. I'm part of a sport where there are multiple individual leagues of 12...

• Replies: 1
• Views: 2,936
12-08-2005, 03:26 PM

• Replies: 1
• Views: 2,465
12-09-2005, 09:30 AM
18. ### 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: 9,639
12-15-2005, 11:13 AM

This problem is driving me crazy! The length of time to complete a door assembly on an automobile factory assembly line is normally distributed...

• Replies: 7
• Views: 17,764
12-18-2005, 01:56 PM
20. ### Probability

The IRS says it will audit about 20 percent of all tax returns next year. What are the odds in favor of your being audited? I cant find the...

• Replies: 1
• Views: 2,950
12-18-2005, 08:54 PM
21. ### Probability

HEllo! I have a trouble with probabilities and I need your help... The probability of an event is 2/10, which means 1/5 = .2 What is the...

• Replies: 3
• Views: 2,549
12-21-2005, 10:37 PM
22. ### hi a problem of probability.

There are 3 bag. there are 5 white and 5 black balls in 1st bag. In the 2nd 4 white and 8 black. in the 3rd8 white n 6 black. A ball is selected...

• Replies: 1
• Views: 2,349
12-22-2005, 09:35 AM
23. ### Probability help

In a poll of married couples, about 79 percent of the men and 55 percent of the women were employed outside the home. In 39 percent of the couples,...

• Replies: 3
• Views: 2,806
12-23-2005, 04:42 PM
24. ### finding non-randomness in binomial successes?

Hi, I've only had one semester of Stats, so this is probably a real newbie question. I'm having problems on deciding how to approach a specific...

• Replies: 7
• Views: 3,304
01-04-2006, 08:04 AM
25. ### Probability Problem

Hi, Here is the problem: Roll a die twice: What is the probability of observing exactly one 5? I think that the answer is 5/36: P(5)=1/6; P(5...

• Replies: 2
• Views: 3,200
01-05-2006, 07:59 AM
26. ### Calculating z value/mean and standard deviation

Hi...have completed my assignment (and have come a long way with some helpful tips on this forum) but am stuck on one problem: In grading apples...

• Replies: 11
• Views: 42,693
01-07-2006, 10:22 PM
27. ### Probabilty problem for a Stock Market System

Hi, I have a Probabilty problem for a Stock Market System. Assume I have backtested a system over say 1,000 historical trades. It wins say 40%...

• Replies: 8
• Views: 4,379
01-09-2006, 09:59 AM
28. ### Help with Probability formual choosing

Just need to know if answer/formual is correct. Aand B equally likely to occur. The Chance that either A or B happens on a given trial of an...

• Replies: 3
• Views: 2,860
01-09-2006, 10:31 AM
29. ### Probability question

get confused :confused: 100 poker hands are dealt from separate well-shuffled decks.The random variable H is the number of hands with at least one...

• Replies: 3
• Views: 3,499
01-09-2006, 10:49 PM
30. ### survey question & conversion to variable

I'm assuming this question will be an ordinal categorical variable. I added the "other" category since there are lots of methods used for dosing. If...

• Replies: 5
• Views: 4,237
01-10-2006, 11:30 PM
31. ### Z tables

Can someone tell me what Z upper and Z lower values are? I am trying to find theoretical parts out of spec. The specifications are -.30 to .30 with...

• Replies: 5
• Views: 6,717
01-12-2006, 12:31 PM
32. ### Probability Problem help

Hey I need help with this problem...I really don't understand how to do Prob. Two number cubes were rolled 100 times. Based on the resul;ts below,...

• Replies: 1
• Views: 3,101
01-12-2006, 05:39 PM
33. ### Lost and need Help

I'm not sure which board this fits into so I posted in both, Sorry! I need assistance on the following problem (I'll state it and then state my...

• Replies: 1
• Views: 3,161
01-12-2006, 07:33 PM
34. ### Need Help Again!!!

The manager of an Apple dealership keeps records on customers visiting the store. Records show that 40% of people visiting the store are female. ...

• Replies: 2
• Views: 2,299
01-13-2006, 12:43 PM
35. ### Independent study help..

Greetings, I am new here and am in the middle of completing a research project for a Business Policy class. I put my Statistics independent class...

• Replies: 3
• Views: 6,191
01-20-2006, 11:38 AM
36. ### Special Dice

Here is the problem: Two players compete against each other by rolling dice- not the traditional dice ,though. One face of Alphonso's die has an 8...

• Replies: 2
• Views: 7,185
01-23-2006, 05:41 AM
37. ### Help

Hello, Here is the problem: "Assume the heights of high school basketball players are normally distributed. For boys the mean is 74 inches with...

• Replies: 2
• Views: 4,820
01-23-2006, 05:49 AM
38. ### Probabilty question

Hi guys just wondering if what I'm doing is correct or not. Any help would be much appreciated. Heres the question: A die is weighted to that...

• Replies: 1
• Views: 3,257
01-23-2006, 01:03 PM
39. ### Binomial probability

Hi, I have the following problem. We are comparing two screening methods in one population. With method A we took 63 samples and 13 were...

• Replies: 2
• Views: 3,080
01-25-2006, 07:30 AM
40. ### how do I do it?

Statistics is not my strength so I hope you can explain this in really easy terms! I don't even understand what this question wants me to do, let...

• Replies: 3
• Views: 6,708
01-25-2006, 11:22 PM
41. ### Conditional Probability

Hey I'm sorry this problem is kind of long, but I really cannot figure it out. The advantage of your experimental blood test is that 95% of the...

• Replies: 2
• Views: 3,714
01-30-2006, 08:35 PM
42. ### PDF and Mean

I have a couple of question here I can't figure out. Does anyone know how to prove these? And can you explain why? Find the probability density...

• Replies: 1
• Views: 2,446
heD
01-31-2006, 11:22 PM
43. ### Pizza toppings problem

Ok - first, let me state the questions, then what I did. Suppose that a pizza shop offers ten different toppings for its pizzas, and you select...

• Replies: 3
• Views: 8,632
02-01-2006, 11:43 AM
44. ### Football Problem

2001 NCAA Poll Will Big 10 or Pac 10 have a team in the Rose Bowl? 13,429 respondents 2961 said Big 10 4494 said Pac 10 6823 said neither ...

• Replies: 2
• Views: 2,891
02-02-2006, 10:27 AM
45. ### US Naval Academy - Annapolis Question

I am old (over 40). The last math type class I took was 23 years ago at Purdue (MA 153), intro to algebra and trig. I am having a tough time...

• Replies: 3
• Views: 4,984
02-02-2006, 02:16 PM
46. ### probability question help

I need help with this question: A computer company receives large shipments of microprocessors. It must ensure that the proportion of them that are...

• Replies: 1
• Views: 2,622
02-02-2006, 03:31 PM
47. ### Facing A Manufacturing Shut Down

OK. Last question for the day. I have completed three others on my own. I am stuck on this one. A purchasing agent placed rush orders with...

• Replies: 3
• Views: 2,467
02-02-2006, 04:35 PM
48. ### Probability/Normal Distribution Table

Just want to check that I am on the right track: Find the probablility that "a" is greater than 0% mean = 13.4% standard deviation = 20% Z =...

• Replies: 2
• Views: 3,882
02-02-2006, 11:56 PM
49. ### Newbie needs cheating probability

Hello, I am hoping someone could shed some light on the following problem; I sure hope I explain it well enough. Student A and B are both...

• Replies: 7
• Views: 3,083
heD
02-04-2006, 09:02 PM

Need guidance. 2 machines, each produce half of the total garments Probability that an irregular garment will come from machine 1 is 0.05...

• Replies: 6
• Views: 3,646
02-04-2006, 10:05 PM
51. ### help with probability questions

HELPPPPPPPPPPPPPPPPPPPPPPPPPP I am struggling with a introductory stats course, and am in need of some free help on some of my questions plse plse...

• Replies: 10
• Views: 6,976
02-05-2006, 10:12 AM
52. ### contingency table

I am trying to build a contingency table but am confused. Here is the data I have: Probability that machine 1 will produce an irregular garment is...

• Replies: 3
• Views: 3,771
02-06-2006, 12:59 PM
53. ### probability help

While visiting a daycare center, you estimate the ratio of toddlers to infants as 3:2. If the center has an enrollment of 25 children about how many...

• Replies: 1
• Views: 2,625
02-06-2006, 10:32 PM
54. ### sampling probabitlity

400 students were surveyed one week prior to the election for student body president regarding their choice of three candidates. The table below...

• Replies: 1
• Views: 2,808
02-06-2006, 10:47 PM
55. ### Help with Prob and Stat question

I received a homework assignment back that was wrong and I'm not sure how to do the problem. The teacher is ignoring my questions on it. Can someone...

• Replies: 5
• Views: 2,991
02-07-2006, 10:18 PM
56. ### Is my thinking correct?

I actually figured this one out ( it took 15 minutes, which is good for me) but need to clarify the answer as the text does not provide it! The...

• Replies: 2
• Views: 2,709
02-07-2006, 11:47 PM
57. ### 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: 2,743
02-08-2006, 12:59 AM
58. ### More questions from the Math Challenged

Here are more questions that I am lost on if anyone cares to tackle. If possible I would like to know the steps to the answer also, not just the...

• Replies: 1
• Views: 3,026
02-08-2006, 01:30 PM

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