Number of results: 22,092
Probability / Statistics
I was wondering if someone could check my work thanks so the question is like so: The time it takes for a pendulum to complete the one period is simplified by the formula: T=2 pi square root (L/g) Where g is the constant measuring 9.80655m/s^2 and L is the length of the ...
Sunday, June 10, 2007 at 3:20pm by z score!
I find the following applet very useful for these kind of problems http://davidmlane.com/hyperstat/z_table.html
Saturday, June 21, 2008 at 11:04am by Reiny
1)Two marbles are chosen at random from a bag containing 3 blue and 2 red marbles. The relative-frequency histogram shows the distribution of the number of red marbles chosen. Find P(0 red). (the gragh shows 3/10 for 0 red, 3/5 for 1 red, and 1/10 for 2 red) A)0 B)8/15 C)3/10 ...
Thursday, February 7, 2008 at 10:17am by Jon
1 and 2 are correct for 3 I got 23/196 there are 25 tickets greater than 25 so prob = 25/50 x 24/49 x 23/48 = 23/196 for 4 you have to use a formula that says: P(A or B) =P(A) + P(B) - P(A and B) since the prob of them being 3 yellow AND 3 blue is zero P(3yellow) = 4/12 x 3/11...
Thursday, February 7, 2008 at 10:17am by Reiny
probability & statistics
I don't get the question. What are A' and B'?
Wednesday, June 13, 2012 at 10:00pm by drwls
Assume 20 oz. cola bottles are filled so that the mean amount of liquid contained in the bottle is 20 oz and the standard deviation is .12 oz. If a bottle is randomly selected, find the probability that the number of ounces in that bottle is greater than 20.21 oz.
Saturday, June 21, 2008 at 11:04am by thomas
In case you do not have a computer available in the future, here is another way to solve the problem. Caculate the Z score. Z = (X-μ)/SD = (20.21-20)/.12 Look up that Z score in a table in back of your statistics text labeled something like "areas under the normal ...
Saturday, June 21, 2008 at 11:04am by PsyDAG
Please help!!! Smith Widget Company makes widgets for the medical industry. One particular customer requires widgets that meet FDA standards. One FDA standard requires Z-testing of at least 100 widgets at a time at the .08 level of significance. The specific standard requires ...
Monday, September 15, 2008 at 1:36am by Student
If you are doing a z-test, you look at a z-table for your cutoff or critical value(s). How do you translate .08 to a cutoff value from the table? It depends on whether the test is one-tailed or two-tailed. For a two-tailed test (cutoff points at both tails), you split the .08 ...
Monday, September 15, 2008 at 1:36am by MathGuru
i need to learn probability & statistics. completly.
Friday, February 8, 2008 at 4:02pm by sai
Two independent events, A and B, satisfy Pr(A) = 0.6 and Pr(B) = 0.3. In the case of Pr(A or B), why isn't the answer 0.3? We are looking at the probability of A or B. I choose B. Thank you!
Tuesday, February 24, 2009 at 2:56pm by David
The answer is Prob(A) + Prob(B) - Prob (A + B)= 0.6 + 0.3 - 0.18 = 0.72 The last term avoids double counting of the occurence of both A and B, which satisfied the "A or B" criterion only once. The answer is certainly not 0.3, since 60% of the events are A and satisfy the A or ...
Tuesday, February 24, 2009 at 2:56pm by drwls
A quiz consists of 10 multiple-choice questions, each with 4 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grade is 70 %. I'm not sure what to do. I figured that there's 10 questions, each ...
Saturday, July 11, 2009 at 2:30pm by Amy
To pass he must guess 1. exactly 7 out 10 or 2. exactly 8 out 10 or 3. exactly 9out 10 or 4. exactly 10 out 10 prob of exactly 7 out 10 = C(10,7)(1/4)^7(3/4)3 = 120(1/16384)(27/64) = .00309 prob of exactly 8 out 10 = C(10,8)(1/4)^8(3/4)^2 = .000386 prob of exactly 9 out 10 = C...
Saturday, July 11, 2009 at 2:30pm by Reiny
Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of many lifestyle variables including how many hours of sleep obtained on a typical day. Researchers found that visually impaired students averaged 9.36...
Saturday, July 11, 2009 at 2:54pm by Amy
Math - Probability Statistics
P(E)=.4, P(F)=.5 and P(E[intersect]F)=.1 , Calculate P(F|E)=? Using conditional probability, I got .2 as the answer, using: P(E[interstect F)/P(F) = .1/.5 = .2 Calculate P(E|F) is .25 using: P(E[intersect F)/P(E) = .1/.4 =.25 Is this now correct?
Monday, August 31, 2009 at 7:40pm by Dee
Probability & Statistics
A basketball player shoots free throws and makes them with probability 1/3. What is the probability the player will miss three in a row?
Thursday, July 29, 2010 at 5:50pm by anonymous
A secretary addresses 50 different letters and envelopes to 50 different people, but the letters are randomly mixed before being put into envelopes. What is the probability that at least one letter gets into the correct envelope?
Monday, April 18, 2011 at 7:45pm by Lisa
Mathematics (Probability, Statistics, etc.)
I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year lapse in education, so my skills are really ...
Sunday, October 30, 2011 at 3:57pm by Matt
Thursday, July 18, 2013 at 9:35pm by Ms. Sue