Number of results: 1,684
STAT-discrete random varaibles
a driver passes 4 sets of traffic lights. the random varaible X is the number of traffic lights he has to stop at. the probabilty distribution for x is given: x 0 1 2 3 4 prob 0.1 0.2 0.3 0.2 0.2 a) find the upper quartile of the number of traffic lights at which the driver ...
Sunday, April 22, 2007 at 5:32am by mick
Math...For All Math Tutors
One of my three sons was a math/econ undergrad major from U Cal Santa Barbara. He found it difficult to get a job at first, then took additional actuary stat/prob correspondence courses and got certified as an actuary. That landed him a great job at Social Security ...
Friday, February 15, 2008 at 10:29am by drwls
Stat hw question help me please? In a high profile murder case a sample of the general public's opinions concerning the guilt or innocence of the defendant is taken. A sample of n=100 males results in 62% of the respondents beliving that the defendant is guilty, while a sample...
Sunday, February 1, 2009 at 9:56pm by helga
the prob of a spade and a heart = 2(13/52)(13/51) = 13/102 so the prob of NOT a spade and a heart = 1 - 13/102 = 89/102 so the odds in favour of drawing a spade and a heart is 13:89
Tuesday, August 11, 2009 at 11:38pm by Reiny
same argument as the previous question... find prob of at least one head = 7/8 etc
Tuesday, August 11, 2009 at 11:42pm by Reiny
ok there was a question that my teacher told me i got wrong the question asked me to compute the mean which I did... then the question went on to tell me compute the mean with another observation equal to zero then the part that he drew the line through was my response to this...
Sunday, September 6, 2009 at 5:17pm by stat
How many standard deviations away from the mean do the quartiles lie in any normal distriubiton?
Thursday, September 17, 2009 at 9:11pm by Stat B
Remeber that it is areas under a density curve, not the height of the curve, that give proportions in a distribuiton. To illustrate this, sketch a density curve that has its peak at 0 on the horizontal axis but ahs greater area within .25 on either side of 1 than within .25 on...
Monday, September 21, 2009 at 5:15pm by Stat
The army reports that the distribution of head circumfererence among soldiers is approximately Normal with mean 22.8 inches and standard deviation 1.1 inches. Helmets are mass produced for all except the smallest 5 % and the largest 5 % of head sizes. soldiers in the smallest ...
Monday, September 21, 2009 at 6:53pm by Stat (Alegra One Help I think)
probability of an incorrect address = 5/100 to have atleast 1 incorrect address out of the 12 customers (choice of 1 out of 12 customers) 12C1 x (5/100) = (12!/ 1! 11!) (5/100) = 12 x (5/100) = 60/100 So for none to be incorrect it will be (1 - Prob of atleast one to be ...
Tuesday, October 20, 2009 at 7:18pm by Vipster
Testing for Alzheimer's disease can be a long and expensive process. Recently, a group of researchers devised a 7min test to serve as a quick screen for the disease. A patient who tested positive would then go through the more expensive battery of tests and medical diagnosis. ...
Tuesday, March 30, 2010 at 8:42pm by Ashley
probability and statistics.
So here I am trying to do my prob/stat homework and I keep coming across this word that I don't understand. The word is "inferior". My book has no glossary and I cannot find a definition that makes sense.Can somebody help me understand?
Thursday, January 27, 2011 at 4:45pm by penny lane
She wins if 1. she draws a heart, but not the ace of heart (40 cents) Prob = 12/52 2. she draws an ace , but not the ace of heart (50 cents) prob = 3/52 3. she draws the ace of hearts ( 90 cents) prob = 1/52 expected return = (12/52)(40) + (3/52)(50) + (1/52)(90) = 13.8 cents ...
Thursday, April 7, 2011 at 1:34am by Reiny
Prob and Stat
A tire manufacturer guarantess that its tires will last for at least 60,000 miles. If the tire fails earlier, the manufacturer offers a prorated replacement. Too many such replacements are bad for business, so the manufacturer tests tires at random to see whether corrective ...
Tuesday, May 17, 2011 at 2:15pm by Angela
Prob and stat
A survey asked people to respond to the statement "I will begin my shopping at the last minute." Thier responses are categorized below. Admitted last-minute shoppers by age group Last minute shopper, under 25, 25 to 44, over 44 Yes, 510, 420, 308 No, 620, 480, 390 Ithere a ...
Tuesday, May 17, 2011 at 2:28pm by Angela
Prob and Stat
Use a one-sample z-test. Formula: z = (sample mean - population mean)/(standard deviation divided by the square root of the sample size) With the data in your problem: z = (58000 - 60000)/(7000/√49) Finish the calculation. If the test statistic exceeds the critical value...
Tuesday, May 17, 2011 at 2:15pm by MathGuru
probability and statistics.
I am preparing for a chapter test in my prob/stat class and since my teacher no longer cares about our class and the textbook is as confusing as a foriegn languaga, i am in need of help. i am trying to review an old quiz ao here is one of the questions. the probability that a ...
Tuesday, May 17, 2011 at 9:52pm by penny lane
Prob ans stat
Let x be a random variable that represents the length of time it takes a student to complete a take-home exam in Dr. Larson's psychology class. After interviewing many students, it was found that x has an approximately normal distribution with mean of 5.2 hours and standard ...
Friday, July 29, 2011 at 12:19pm by Hannah
If P(A) = .3 and P(B) = .4 and P(AandB) = .2 what is P(A/B)? P(B/A)? Are A and B indepentent?
Sunday, April 1, 2012 at 8:44am by Sheila
Tuesday, March 30, 2010 at 8:42pm by Anonymous