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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: 30,232
09-30-2005, 09:44 AM

Eight tyres of different brands are ranked from 1 to 8 (best to worst) according to mileage performance. If four of these tyres are selected at...

• Replies: 2
• Views: 8,483
03-20-2006, 10:42 AM
2. ### creating sten scores

Hi, Please can someone help me out with creating a sten score - I am unsure of the process to follow to do this - is it something that can be...

• Replies: 0
• Views: 5,997
03-20-2006, 12:01 AM
3. ### Having a little trouble with this question:

A 28 yr. old man pays \$158 for a one year life insurance policy with coverage of \$110,000. If the probability he will live through the year is...

• Replies: 1
• Views: 2,812
03-19-2006, 10:22 PM
4. ### In a certain town....

40% of voters favor a given ballot measure. For groups of 22 voters, find the mean and standard deviation for the number who favor the measure.

• Replies: 0
• Views: 4,312
03-19-2006, 10:21 PM
5. ### Probability question

Hi, I guess it will be an easy question for you. I am just getting started with probability and have not understand it good. I have some basic...

• Replies: 1
• Views: 2,505
03-16-2006, 09:26 PM

There are two diagnostic tests for a disease. Among those who have the disease, 10% give negative results for the first test and, independently of...

• Replies: 1
• Views: 2,526
03-16-2006, 10:46 AM

I am stuck on the following question for my coursework. A factory produces metal rods. One project requires that the rods are 60 + or - 0.2 cm...

• Replies: 4
• Views: 2,138
03-12-2006, 07:33 PM
8. ### Event Certainty

Please help. Can it be concluded that if there is a 50% chance of contracting a communicable disease through contact with an infected person, there...

• Replies: 1
• Views: 3,677
03-12-2006, 01:23 PM
9. ### 3 Coin Bet

• Replies: 3
• Views: 3,665
03-11-2006, 09:56 PM
10. ### Rolls of die

Please help me with this problem: A man won in a bet that in 4 rolls of a die, he could get at least one 6. However, he lost in a bet that in 24...

• Replies: 1
• Views: 3,548
03-11-2006, 09:52 PM
11. ### I am having trouble with normal approximation to the binomial.

Approx 57% of people taking the bar exam pass. If 500 people take the exam, find the probablity that 300 or less pass the exam. n= 500 p= .57 q =...

• Replies: 2
• Views: 3,120
03-09-2006, 10:13 AM
12. ### Proof

Hi everybody! We would like to proof the following statement: given a random variable X with probability density function f(x) having support in...

• Replies: 0
• Views: 2,477
03-09-2006, 09:52 AM
13. ### elementary terminology question

I work with elementary students and want to make sure I am using precise terminology with them. I've searched the web, math dictionaries, books etc....

• Replies: 3
• Views: 3,191
03-08-2006, 10:17 PM
14. ### random sample probability question

A company produces cola. The amount of cola in a can is a random variable that is normally distributed with a variance of 0.81 ml. A random sample of...

• Replies: 2
• Views: 3,249
03-08-2006, 02:11 PM
15. ### Easy question for you people

Hi all, A gambling question What procedure/formula would I use to work out the following. If I have a win strike rate of 20% how do I work...

• Replies: 2
• Views: 2,415
03-07-2006, 12:31 PM
16. ### Negative Binomial Distribution HELP PLEASE!

Hi. My statistics professor assigned an extra credit problem that is due on March 6th and I was wondering if anyone can help me solve it. The...

• Replies: 2
• Views: 3,874
03-06-2006, 06:28 AM
17. ### need assistance

I am taking a course in safety and now have one class left, but ran into a big problem. This class has statistics and I don't have a clue. The text...

• Replies: 5
• Views: 36,036
03-05-2006, 06:23 PM
18. ### Distribution probability

Hi, I'm new here but this question really has me stumped... A distribution of scores has a standard deviation of 4.9326 and a population mean of...

• Replies: 3
• Views: 2,964
03-03-2006, 11:06 PM
19. ### Challenging Probability Question

An analyst is presented with lists of four stocks and five bonds. He is asked to predict, in order, the two stocks that will yield the highest return...

• Replies: 2
• Views: 4,079
03-03-2006, 01:37 AM
20. ### Moved: Help, and I have no statistical background.

I am taking a course in safety and now have one class left, but ran into a big problem. This class has statistics and I don't have a clue. The text...

• Replies: -
• Views: -
03-01-2006, 01:08 PM
21. ### factorial.. with replacement?

Here is the problem.. (literally..) In your stats class, the teacher has three drawing for prizes (a, b , c). There are 15 students in class ...

• Replies: 2
• Views: 6,640
03-01-2006, 07:35 AM
22. ### random variable x

Consider a continuous random variable X with the density function (called the exponential density) f(x) =8<: e^-x if x = 0; and 0 otherwise: a)...

• Replies: 1
• Views: 3,039
02-28-2006, 11:48 PM

You are doing an industry analysis of the Bloomington pizza industry. The rate (per year) at which pizza restaurants enter the industry is given by...

• Replies: 0
• Views: 3,729
02-28-2006, 12:09 PM
24. ### Probabilities for a card game

the other day my son and i invented a card game where you are dealt three cards and then do a typical draw discard turn in trying to get a total of...

• Replies: 2
• Views: 3,968
02-27-2006, 02:10 PM
25. ### This is not homework. Just for entertainment.

My gaming clan was having a dispute over some voting procedures and I posed a question for them to answer. If they get it right I would donate an...

• Replies: 4
• Views: 3,044
02-27-2006, 07:57 AM
26. ### Stuck on this...

I'm kind of stuck on my homework. I was given a chart of a total of 1052 people (men 495, women 557) in four categories: nonsmokers (men 335,...

• Replies: 1
• Views: 3,276
02-26-2006, 10:39 PM
27. ### I need help with these problems,

Hey everyone, I am new at this forum. I need help with these problem... I hope you can provide me with full solution and steps please...

• Replies: 1
• Views: 6,085
02-26-2006, 10:34 PM
28. ### Expected value

Hi, have a question about expected value, there is only a few lines my text book regarding this. The prizes that can be won in a sweepstakes are...

• Replies: 2
• Views: 6,316
02-25-2006, 10:50 PM
29. ### Probability Questions

1) Out of 2 million hay fever sufferers in Canada, 78% are allergic to ragweed. If a random sample of 7 hay fever sufferers is selected, a)...

• Replies: 1
• Views: 3,865
02-25-2006, 05:23 PM
30. ### Candy Slection

There are five candy bars in a box and one of them is a snickers bar. If two children pick out two candies each what is the chace that I will get the...

• Replies: 7
• Views: 2,794
02-23-2006, 11:27 PM
31. ### Poisson question

Can anyone help woth this? Mineral desposits in a certain area occur in a spatial Poisson process of rate 1per 100km2. A mining company buys...

• Replies: 3
• Views: 2,967
02-23-2006, 04:44 PM
32. ### What do you think ?

I am new to stats so I need help They have also asked the probability of an individual consumer receiving a prize over the course of a year. For...

• Replies: 2
• Views: 2,129
02-23-2006, 01:07 PM
33. ### A Few More Questions...

My study group and I are struggling.... 1) A certain lottery has 49 numbers, 6 of which are the winning numbers for a particular game. To play...

• Replies: 2
• Views: 2,361
02-21-2006, 02:06 PM
34. ### Full House

"In poker, a full house is a 5-card hand with 3 cards of one rank and 2 cards of another rank. Suppose you are dealt 5 cards from a standard 52-card...

• Replies: 2
• Views: 2,925
02-21-2006, 01:28 PM
35. ### Hypergeometric Probabilities

These are similar in principle to the binomial distribution, with one major exception - the hypergeometric probability is for situations where you...

• Replies: 0
• Views: 12,545
02-20-2006, 11:59 AM
36. ### KENO probability

"In the game of Keno, 80 numbers are displayed on a reader board. 20 of these numbers are chosen to be the winning numbers. Suppose a person has...

• Replies: 3
• Views: 5,390
02-20-2006, 10:48 AM

Hi guys, I have a problem which should be pretty basic, but I cannot remember how to do it. There is a probability p that one water customer...

• Replies: 9
• Views: 3,246
02-18-2006, 02:30 PM
38. ### help with questions

1. probability that 4 randomly selected people all have different birthdays? answeres: 0.9891 or 0.9836 show me how to get answere please 2....

• Replies: 2
• Views: 2,980
02-18-2006, 12:12 AM
39. ### Difficulty correlating terminology with symbols.

The book we are using for this class uses words instead of the symbols in some of the homework problems we are using. My question is: Is P(A...

• Replies: 2
• Views: 5,140
02-17-2006, 12:11 PM
40. ### Fitting words into probability rules

I am confused as to what rules to apply when i encounter conditional probability word problems, especially problems involving decks of cards. ...

• Replies: 3
• Views: 3,907
02-16-2006, 11:01 AM

Regarding Question #2 In grading apples into "A","B" and "C" a large orchard uses weights to distinguish apples. Any apple weighing more than...

• Replies: 4
• Views: 3,457
02-15-2006, 02:29 PM
42. ### having difficulty with question similiar to previous post

Still having difficulty solving for u and s Question is It is known that the IQ scores of workers in a certain company are normally...

• Replies: 2
• Views: 3,570
02-15-2006, 12:32 PM
43. ### 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: 18,983
02-14-2006, 12:26 PM
44. ### Thank You All!!

The probability of me passing a test with out your willingness to help me understand statistics and probabilites is the following: P(A U B U C U...

• Replies: 1
• Views: 2,628
02-14-2006, 11:16 AM
45. ### Black Jack Anyone?

Using the hypergeometric probability function below: P(x) = (r/x)((N-r)/(n-x))/(N/n) P(x) = probability of x success in n trials n = number of...

• Replies: 3
• Views: 5,892
02-13-2006, 03:02 PM
46. ### Discrete Probability Distributions - Shoot me now!

I spent three hours at a basketball tournament trying to figure these out. Please help. Using the Poisson Probability Distribution I have the...

• Replies: 2
• Views: 26,494
02-13-2006, 09:58 AM
47. ### stressed out in Binomial distributions

Two Question first one I have answered just checking to see if process is correct...........Second question I just cant get my head around First...

• Replies: 1
• Views: 3,329
02-10-2006, 08:45 PM
48. ### Probabilty question

Hi guys, I was stuck on these particular questions and have tried to include a bit of what I thought would lead me to the answer. Can anyone help...

• Replies: 1
• Views: 3,280
02-09-2006, 11:42 AM
49. ### How do I finish out this problem?

Question: John is traveling to Las Vegas to bet his entire life savings, \$20,000, on one roll of the (two) dice. If the total is 7 or 11 he will...

• Replies: 1
• Views: 2,775
02-08-2006, 01:31 PM
50. ### 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: 3,006
02-08-2006, 01:30 PM
51. ### 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: 2,720
02-08-2006, 12:59 AM
52. ### 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: 2,694
02-07-2006, 11:47 PM
53. ### 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: 2,977
02-07-2006, 10:18 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: 2,798
02-06-2006, 10:47 PM
55. ### 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: 2,616
02-06-2006, 10:32 PM
56. ### 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: 3,750
02-06-2006, 12:59 PM
57. ### 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: 6,941
02-05-2006, 10:12 AM

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: 3,620
02-04-2006, 10:05 PM
59. ### 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: 3,065
heD
02-04-2006, 09:02 PM
60. ### 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: 3,857
02-02-2006, 11:56 PM

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