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Probability & Statistics/Questions
| Subject | Date Asked | Expert |
| permutations and combinations | 12/7/2007 | Soroban |
| Q: can you explain the difference between permutations and combinations?how will you find out whether a ... A: Monisha! A permutation is when the order makes a difference. A combination is when the order does ... | ||
| Probability Help | 12/5/2007 | Soroban |
| Q: I just need to know where to start, and the formula, I have similiar questions in my notes but the ... A: Will! I assume that "between 5 and 7" means: 5, 6, or 7. So we must calculate those three ... | ||
| probabilty | 12/4/2007 | Soroban |
| Q: what is the probability of rolling a double either on the first or second roll with two dice A: Nikhil! There are 36 possible outcomes with a pair of dice. There are 6 outcomes which are doubles. ... | ||
| probabilities | 12/2/2007 | Soroban |
| Q: A friend who works in a big city owns two cars, one small and one large. Three quarters of the time ... A: Sally! This is a Conditional Probability problem. We need Bayes' Formula. We're given some ... | ||
| probabilty | 11/28/2007 | Soroban |
| Q: suppose two fair, 6 sided dice are tossed. What is the probability that the sum equals 10 given it ... A: Nikhil! With a pair of dice, there are no neat formulas. We must list (or visualize) the ... | ||
| probabilty | 11/28/2007 | Soroban |
| Q: A fair six sided die is tossed. What is the probability the first 5 occurs on the fourth roll A: Nikhil! The probability of a 5 is: P(5) = 1/6 The probability of another number is: P(other) = ... | ||
| Bingo probability | 11/28/2007 | Soroban |
| Q: I person I met the other day runs a type of bingo on a cruise ship and I am wondering what the ... A: Peter! The game of Bingo does not have any easy answers. I can give one VERY simplified version, ... | ||
| Probability and Statistics | 11/21/2007 | Soroban |
| Q: Women make up 24% of the science and engineering workforce. In a random sample of 400 science & ... A: J.R.! Who assigned this problem?? The work and the answer is way too long and tedious! Maybe they ... | ||
| spss data inputting | 11/20/2007 | Ellis Godard |
| Q: i would like to analyse some data using spss, however what do i do when there is more than one ... A: if you're using a relatively recent version, spss will open by default to a spreadsheet window where ... | ||
| Probability and Statistics | 11/20/2007 | Soroban |
| Q: I have this problem I can't seem to figure out: Suppose that a judges's verdict is correct 90% of ... A: Darrel! We have: P(correct) = 0.90, P(wrong) = 0.10 And we have: 10 trials "Fewer than ... | ||
| statistics | 11/19/2007 | Soroban |
| Q: A probability experiment has two steps. There are two possible results for the first step, call them ... A: Kate! This is easier than I thought . . . There are only: 3 + 16 = 19 outcomes. I thought it ... | ||
| Probability | 11/14/2007 | Ellis Godard |
| Q: Does it make real sense to calculate the probability of a completed event? If one out of 12 women ... A: This question is partly philosophical, rather than statistical, although there may be an empirical ... | ||
| Lottery Probability Question | 11/8/2007 | Soroban |
| Q: My son has these series of questions given to him as homework in his 4th grade math class. The ... A: Sha Coda! Yes, you got part (A) correct. Those are the primes among the numbers from 1 to 49. (B) ... | ||
| probability queswtion help | 11/6/2007 | Soroban |
| Q: i have this problem, and im not understanding it very well. there are 128 students in a class, 28 ... A: Ryan! There are a number of ways to solve this problem. I'll give you the simplest method. There ... | ||
| Probability | 10/28/2007 | Soroban |
| Q: A box contains seven red and 13 blue balls. Two balls are selected at random and are discarded ... A: Ben! This is a Conditional Probability problem. You're expected to know the formula for it. ... | ||
| Statistics - Poker | 10/23/2007 | Soroban |
| Q: I have another one that I think I am on the right track with but wanted to make sure... In 5 card ... A: Erica! Your reasoning is correct ... but incomplete. A ten-high straight would be: 6-7-8-9-10 ... | ||
| Statistics - Independence | 10/23/2007 | Soroban |
| Q: I am having trouble with the following problem: Two pumps connected in parallel fail independently ... A: Erica! The keyword is "independent". We are given that: P(old fails) = 0.10 P(new fails) = ... | ||
| regression lines | 10/21/2007 | Ellis Godard |
| Q: there are two regression lines ,why? A: There are an infinite number of regression lines - at least two for every equation. One represents ... | ||
| pl. reply to this question as soon as possible | 10/19/2007 | Soroban |
| Q: If a gathering of 1000 people everyone shakes hand with everyone else once then how many hand shakes ... A: gurpreet! We can reason it out ... if we're careful. Consider any person, say "A". He will shake ... | ||
| Dependent variable and Independent varible | 10/19/2007 | Ellis Godard |
| Q: Can you have a Dependent variable and not have Independent? A: In principle, no. The dependent variable wouldn't be considered dependent without thinking that the ... | ||
| Probability of Poker Hands | 10/15/2007 | Soroban |
| Q: I am having trouble with the following problems. 1)How many 5 card poker hands are there? and 2)What ... A: Camilla! Who assigned this problem? This is a GIGANTIC task! Even those experienced with ... | ||
| probability | 10/14/2007 | Soroban |
| Q: 25 coloured cubes, 5 each of red,blue, green, yellow,black in a bag. I choose 2. What is the chance ... A: Brian! Your son is 11 and he's doing Probability? . . . Wow! There are complex methods for doing ... | ||
| Probability | 10/2/2007 | Soroban |
| Q: A study conducted at a certain college shows that 57% of the school's graduates find a job in their ... A: Deb! I don't know how you came up with your answer . . . The opposite of "at least one" is "NONE". ... | ||
| Random...or not so random...chance. | 10/1/2007 | Ellis Godard |
| Q: I asked Soroban but he said it was outside his area of expertise. Perhaps you can help. I was ... A: I'm not sure about the math, but you're right to be suspicious. The same student being selected that ... | ||
| statistics question | 9/30/2007 | Ellis Godard |
| Q: how do changes in the size of a subsample affect shape of distributions? I am taking a random ... A: increasing any (sub)sample size should, over the long run, "smooth" the distrubution's "curve" and ... | ||
| coin flip probability | 9/30/2007 | Soroban |
| Q: If a fair coin is flipped 20 times, what is the probability that heads will come up EXACTLY 9 time. ... A: Kelly! You have a chart for the answers? . . . Great! There is a formula for these "binomial" ... | ||
| Inventory sample size | 9/27/2007 | Ellis Godard |
| Q: i have seen a few posts with regard to sample size but i cant find how to do this, so here it goes. ... A: there are many resources for this on the web. search (eg on google) for "sample size calculator 95 ... | ||
| word problem | 9/24/2007 | Soroban |
| Q: if we follow the hour and minute hands of a clock for 24 hours how many times will they form a right ... A: JM! I'm sure there's an algebraic approach to this problem, but I haven't found it yet. If we ... | ||
| Probability- Poker Hands | 9/17/2007 | Soroban |
| Q: I am stuck on the following"A poker hand consists of 5 cards dealt from an ordinary deck of 52 ... A: Shanynn! >> For example C(4,3) = 4 ways. C(4,3) is a symbol for "4 things, taken 3 at a time". ... | ||
| Probability- Poker Hands | 9/17/2007 | Soroban |
| Q: I am stuck on the following"A poker hand consists of 5 cards dealt from an ordinary deck of 52 ... A: Shanynn! >> A poker hand consists of 5 cards dealt from an ordinary deck of cards. >> a) How ... | ||
| Probability | 9/12/2007 | Soroban |
| Q: Of the 20 light bulbs in a box, 2 are defective. An inspector will select 2 light bulbs ... A: Ryan! There are 20 bulbs: 2 defective and 18 good. Two bulbs are drawn at random. We want the ... | ||
| probability | 9/3/2007 | Soroban |
| Q: The past records show that the probability of a river crossing the high flood mark in a year is 1/5. ... A: asif! There is a cute trick we can use . . . We are told that: Pr(flood) = 1/5 = 0.2 ... | ||
| dependent vs independent variables | 9/3/2007 | Ellis Godard |
| Q: I am just having a bit of confusion determining the difference between the independent and dependent ... A: the dependent variable is the "effect", result, outcome, etc. the independent variable is the ... | ||
| probability | 9/2/2007 | Soroban |
| Q: Approximately 30% of all homes in a licality have washing machines.What is the probabilty that in a ... A: aasef! If this is a "Binomial Probability" problem, there is far too much work involved. ... | ||
| probability | 8/31/2007 | Soroban |
| Q: Six seniors and five junior are running for 4 seats of running the prom activities. Find the odds ... A: Jill! >> Six seniors and five junior are running for 4 seats. >> Find the odds that it contains ... | ||
| probability | 8/31/2007 | Soroban |
| Q: All of David CD's are mixed up in a drawer. Twelve Cds are rock, 8 are jazz, 5 are classical. He ... A: Bill! >> All of David's CDs are mixed up in a drawer. >> Twelve CDs are rock, 8 are jazz, 5 are ... | ||
| probability | 8/30/2007 | Soroban |
| Q: 1)Three letters are selected from the word Arrangements. Find the probability that all three are ... A: Matt! >> 1) Three letters are selected from the word "ARRANGEMENTS". >> Find the probability that ... | ||
| Probability | 8/30/2007 | Soroban |
| Q: A jar contains 3 pennies, 8 nickels, 4 dimes, and 10 quarters. Two coins are selected at random. ... A: John! >> A jar contains 3 pennies, 8 nickels, 4 dimes, and 10 quarters. >> Two coins are ... | ||
| Probability | 8/30/2007 | Soroban |
| Q: A jar contains 3 pennies, 8 nickels, 4 dimes, and 10 quarters. Two coins are selected at random. ... A: John! There are number of ways to solve this problem. I'll use the easiest method. There are ... | ||
| Sample size | 8/27/2007 | Ellis Godard |
| Q: The company I work for has 2100 employees. We are interested in surveying a sample of our workforce ... A: the minimum sample size requirements do indeed vary by test, so you'll want to resolve that asap. ... | ||
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Soroban
Top Expert on this page
Expertise
I can teach and explain topics up to Differential Equations. Although Statistics has always been my weakest subject, I am very capable in Combinatorics and Probability.
Experience
38 years of teaching college-level math, mostly at a two-year college.
Publications
Journal of Recreational Mathematics.
In the mid-1980's I had a bi-montly column in BYTE magazine, combining recreational math and programming in BASIC.
Education/Credentials
BS and MS in mathematics, SUNY Albany
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