Sunday

April 26, 2015

April 26, 2015

Number of results: 516

**Prob/Stat**

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?
*April 1, 2012 by Sheila*

**Prob&Stat**

If 52% of the customers at a certain grocery store regularly use coupons, what is the approximate standard deviation of the sampling distribution of the proportion for samples of size 240? 2.1% 3.2% 4.7% 10.4%
*December 14, 2014 by Bailey*

**prob. & stat**

A traveler has 7 pieces of luggage. How many ways can he select 3 pieces of luggage for a trip? a. 5040 b. 210 c. 35 d. 28
*April 1, 2015 by sweet12*

**prob. & stat**

A group of 150 students were asked to identify 55 flowers. The relative frequency table shows the results. About how many students identified at least 42 flowers? 0-6 5 7-13 14 14-20 6 21-27 11 28-34 19 35-41 29 42-48 13 49-55 3
*April 1, 2015 by sweet12*

**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?
*January 27, 2011 by penny lane*

**math**

the probabilities that 3 friends A,B andC pass a driving test are1/3,1/4,2/5 respectively.All 3 take the test find the probability that(a)aa 3 failed the test (b) only B passes the test(c) only 2 of them pass the test (d)at least 1 passes the test... I will do one. Assuming ...
*June 26, 2007 by celina*

**stats**

a test consists of 25 multiple choice questions. Each has 5 possible answers, which only one is correct. If a student guesses on each question, find the following: a) prob that he will guess all of them right b)prob that he will guess at most 12 right c) prob that he will ...
*February 18, 2011 by gio*

**prob. & stat**

suppose 240 nursing students took a certification test that is worth 140 points. the five number summary for the scores is shown here. about how many students had a score of 130 or less min. value=68, Q1=110, median=125, Q3=130, max-value=138
*March 31, 2015 by sweet12*

**statistics**

Use the normal dist to approx the desired prob. Find the prob of getting at most 30 fives in 200 tosses of a fair 6 sided die
*October 4, 2013 by Sandra*

**Statistics**

How do I plug this into the Binomial Probability Formula? prob(lost) = 5/1000 = 1/200 prob(not lost) = 199/200 prob( 2 of 22 are lost) = C(22,2) (1/200)^2 (199/200)^20 = .005224..
*March 9, 2014 by Brenda*

**prob. & stat.**

A pond is freshly stocked with 15 brown trout and 9 lake trout. The first fisherman in the area catches and releases a trout. He catches another trout a while later. What is the probability that the fisherman caught brown trout each time?
*April 1, 2015 by sweet12*

**statistics**

survey revealed two percent of students did not select stat. for biz. suppose we select a sample of 10 students. -what is the probability that 3 students selected stat. for biz? -how many students would you expect to select stat.for biz?
*March 8, 2010 by nora*

**Math**

How do I work this math prob. I always have a B and would like to bring it up. Caan you PLEASE help me with this prob. on unit rates "$2 for 5 cans of tomato soup"
*January 10, 2011 by Sarah*

**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 ...
*May 17, 2011 by penny lane*

**math- algebra- help please!**

3 dice are rolled let (y,r,b) represent each outcome? a- sample space b- prob rolling a sum of 18 c- prob of rolling a sum less than 5
*April 6, 2011 by Zach*

**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 ...
*May 17, 2011 by Angela*

**prob and stat**

Ramon has applied to both Princeton and Stanford. He thinks the probability that Princeton will admit him is 0.4, the probability that Stanford will admit him is 0.5, and the probability that both will admit him is 0.2.
*October 30, 2011 by ecey*

**algebra**

Prob.1: -14=2x+2x-2 Prob.2: 5x=50
*May 29, 2013 by cheyenne*

**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 ...
*July 29, 2011 by Hannah*

**Statistics**

DIAGRAMS MUST BE DRAWN Given the standard normal distribution, determine:Prob Z greater than 1.50 Prob Z between1.06 and 1.96 Given the standard normal distribution determine the Z values that contain 80% in the middle of the curve.
*March 2, 2013 by Sue*

**Probability and Statistics (Continuation)**

Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth trial? MY answers: a) P...
*September 29, 2013 by Katy*

**STATISTICS**

PINWORM INFESTATION COMMONLY FOUND IN KIDS CAN BE TREATED WITH THE DRUG PYRANTEL PAMOATE. RESEARCH SHOWS THE TREATMENT IS EFFECTIVE IN ABOUT 90% OF CASES. DRUG IS ADMINISTERED TO 25 KIDS WHAT IS THE PROBABILITY THAT EXACTLY 23 OF THEM ARE CURED? WHAT IS THE PROB. THAT MORE ...
*February 10, 2008 by todd*

**statistics**

PINWORM INFESTATION COMMONLY FOUND IN KIDS CAN BE TREATED WITH THE DRUG PYRANTEL PAMOATE. RESEARCH SHOWS THE TREATMENT IS EFFECTIVE IN ABOUT 90% OF CASES. DRUG IS ADMINISTERED TO 25 KIDS WHAT IS THE PROBABILITY THAT EXACTLY 23 OF THEM ARE CURED? WHAT IS THE PROB. THAT MORE ...
*February 10, 2008 by todd*

**statistics**

Pinworm infestation commonly found in kids can be treated with the drug pyrantel pamoate. Research shows the treatment is effective about 90% of cases. The drug is administered to 25 kids. What is the probability that exactly 23 of them are cured? What is the prob. that more ...
*February 10, 2008 by todd*

**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 ...
*May 17, 2011 by Angela*

**Finance**

Assuming that the returns from holding small-company stocks are normally distributed, what is the approximate probability that your money will double in value in a single year? What about triple in value. Many of my classmates have an expected return of 17.6% and a standard ...
*July 15, 2012 by Anonymous*

**ECON! Please help!**

Joe: y= 100 (High) prob = 2/5 =25 (medium) prob= 2/5 =0 (low) prob = 1/5 Calculate: 1. José’s risk premium, p, associated with farming and 2. José’s certainty equivalent associated with farming. The village decides to implement an informal insurance (risk sharing) arrangement...
*June 1, 2010 by anonymous*

**Check answers please Statistics**

Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent =15.16 2) one student is absent =30 3) three student is absent =...
*April 8, 2013 by Chris*

**Math Help **

Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent 2) one student is absent 3) three student is absent 4) at least ...
*April 8, 2013 by Chris*

**statistics**

Information given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm first question -the prob that HC of a random chosen man is larger than 57.8cm is? Work: pr(x)>57.8cm z=(57.8-56)=1.8--->.9641 i got it wrong...
*April 15, 2010 by UPD*

**Stats**

nformation given:the distribution of male head circumference (HC) is normal with a mean of 56cm and a standard deviation of 1.8cm first question -the prob that HC of a random chosen man is larger than 57.8cm is? Work: pr(x)>57.8cm z=(57.8-56)=1.8--->.9641 i got it wrong...
*April 15, 2010 by UPD*

**math/prob stat**

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. ...
*March 30, 2010 by Ashley *

**math**

The probability that a person has immunity to a particular disease is 0.3. Find the mean and standard deviation for the random variable x, the number of people who have immunity in samples of size 28. This is a binomial distribution. mean= 28*.3 standard deviation= sqrt (28*.3...
*August 18, 2007 by manny*

**math**

dale placed six cARDS IN A BAG.QONE CARD IS LABELD 1,TWO CARDS ARE LABELD2,AND RTHREE CARDS ARE LABELD 3.FIND THE PROBABILITY OOF PICKING TWO CARDS IN THE ORDER OF THE NUBERS LISTED TH EFIRST CARD IS RETURNED BEFORE THE SECOND IS PICKED ..... P,(1,2) P(3,NOT1) p(NOT2,2) P(1,3...
*May 22, 2007 by sam*

**stats again**

ok I get it, so once I get the prob figred for one person, how do I figure it if additional attempts are made and the question is about the prob of at least one of the additional attempts say n = 6 getting the same results as the first Once you have the probability of passing ...
*July 5, 2007 by holly*

**algebra**

another prob(last one) 6x-7x=18
*June 8, 2010 by Anonymous*

**quantum**

prob 2 ans please?
*September 13, 2013 by Anonymous*

**math prob**

how many midsegments does a triangle have?
*May 8, 2009 by gabe*

**math**

so the prob of drawn an ace or spade is 4/52
*October 27, 2009 by rency*

**chemistry **

So i if do 4 x250/100 i will get the answer for the prob?
*July 18, 2014 by kody*

**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 ...
*April 22, 2007 by mick*

**Math Prob**

ok for changing the base of a log from 10 to e is there a formula?
*December 11, 2008 by confused*

**SPELLING PLEASE help**

the prob is: middle : center :: thinner : s _ _ _ _er
*November 27, 2007 by Amber*

**Stat**

P(A)=.10, P(B)=.30, P(C)=.40, P(D)=.10, P(F)=.10. Determined the expected grade and variance for the course.
*April 17, 2011 by RB*

**MATH Prob.**

How many different ways can a teacher line up 5 students for lunch?
*August 20, 2009 by Twg*

**stats & prob.**

Given the values of n=5, p= 0.15, and (1-p)=0.85, calculate the standard deviation of the data.
*November 27, 2012 by Georgia*

**probability!**

we were given a chart - "researchers developed the following tabel of joint probabilities of number of drinks per day and development of ulcers" and the question is a. what proportion of people have ulcers - how am i supposed to know htis b. what is the prob that someone who ...
*October 21, 2010 by Lauren*

**stat **

I posted a question but never got an answer.
*October 20, 2010 by jackie*

**chemistry**

which element has the ground-stat electron configuration [Ar]4s^2 3d^10?
*October 20, 2010 by Raynique*

**prob.**

If it is given that P(A)=1/3 and P(B/A)=2/3 (the dividing sign is ment to be a vertical bar), what is P(A and B). I got .07. Is this correct? If it isn't, why not?
*December 18, 2008 by Juliette*

**MATH Prob.**

How many three-symbol codes can be formed from the letters I, S, P, and Y without repetition?
*August 6, 2009 by Twg*

**STAT**

A random variable X2 assumes only positive value.?
*October 11, 2011 by azriel ed pagayunan*

**MATH Prob.**

Three angles of a quadrilateral each measures 87*(degrees)..what is the measure of the fourth angle??
*August 19, 2009 by Twg*

**MATH Prob.**

What is the expected value of one 700 tickets in a raffle for a prize of $1400?
*August 20, 2009 by Twg*

**stat**

When rolling a die, is this an example of a discrete or continuous random variable?
*June 17, 2013 by Bruce*

**juvenile deliquency**

Compare and contrast the stat and local diversionary programs
*June 1, 2014 by Starr*

**probability**

A coin is biased such that a head is thrice as likely to occur as a tail. Find the probability distribution of heads and also find the mean and variance of the distribution when it is tossed 4 times. See http://www.stat.yale.edu/Courses/1997-98/101/binom.htm Let p be the ...
*January 21, 2007 by mohsin*

**MATH Prob.**

how many three letter symbols can be formed from the letters A,C,K,L, & M without repetition? so far I have 12
*August 8, 2009 by Twg*

**Algebra 2: Prob and Stats**

Find the sample size that produces the margin of error +-4.0% a) 325 b) 25 c) 16 d) 625
*May 24, 2010 by Skye*

**Stat B**

How many standard deviations away from the mean do the quartiles lie in any normal distriubiton?
*September 17, 2009 by Stat B*

**stat**

Standard deviation for the following sets and compare the differences. first 7 #'s 57 61 57 57 58 57 61 second 7#'s 61 52 69 64 46 54 47
*April 12, 2010 by Dannette Fulcher *

**MATH Prob.**

if you have two fair dice that are rolled, what is the probability of a sum 6 given that the roll is a 'double'?
*August 8, 2009 by Twg*

**MATH Prob.**

What are the odds in favor of getting at least one head in three successive flips of a coin?
*August 11, 2009 by Twg*

**MATH Prob.**

There are 6 contestants in a singing competition. How many different ways can first, second, and third place be awarded?
*August 20, 2009 by Twg*

**stat**

The total area under the normal distribution curve is equal to a probability of____
*May 7, 2012 by Nichole*

**Stat**

Please help with this problem, not sure calculate it. Consider the standard normal distribution and find P(-1.5 < Z < 2.35).
*December 14, 2012 by Annie*

**stat math**

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...
*February 1, 2009 by helga*

**Prob and Stats**

In a multiple regression with 5 predictors in a sample of 56 U.S. cities, what would be the critical value for an F test of overall significance at a= .05? A. 2.45 B. 2.37 C. 2.40 D. 2.56
*December 9, 2009 by please help!*

**Calculus**

I'm having difficulty figuring #2 of this prob;em. I'm utterly clueless. Can someone explain it? Please and thank you. y=x 2. List the roots of the function.
*August 18, 2011 by Elee*

**PLEASE HELP - DIVISORS PROB**

What is the probability that a randomly selected divisor of 720 is a multiple of 4? Express your answer as a common fraction.
*November 15, 2012 by failureinmath*

**health**

what is a catchy starting sentence to stat talking about " hip replacement system recall"?
*September 7, 2010 by harrison*

**stat**

couple plans to have four children what is the probability that three are girls and one is a boy
*January 26, 2014 by jerry*

**Math(Stat)**

If the tube were guaranteed to last for 600 hours, what percent of the tubes may have to be replaced under the guarantee
*November 25, 2011 by Anonymous*

**STAT**

Let X be equal to the number of heads from tossing a coin twice. Verify that the following is the probability mass function of x. p(X x)=1/2(2-x)x!
*April 30, 2012 by Michelle*

**STAT**

Determine the mean and standard deviation of the random variable for which the probability mass function is defined as follows: P(X=x)= x-2/30 if x=3,12,21
*May 1, 2012 by Michelle*

**Stat**

What particular measure of correlation would be most appropriate for use with two variables measured at an ordinallevel?
*December 4, 2012 by Rolando*

**stat**

if the heights of men follow a normal distribution, and 99.7% fall between 5" and 7" what is the estimate standard deviation of the height?
*February 2, 2013 by lena*

**STAT**

Explain what each of the three most widely used measures of central tendency indicate to a psychological researcher.
*September 9, 2013 by Jaky*

**Stat**

three identical chips, each with 0 on one side and 1 on the other, are the tossed simunltaneously. a. write the sample space
*June 30, 2014 by cee*

**math**

am having prob..wv zs numb..given that f(x)=x+6/2x,find f(4) and f inverse(x) am not sure abt the answer the frst 1,i get 1.25 and the second oneeee i dnt knw hw to do it
*September 16, 2008 by pallaa*

**MATH Prob.**

How many batting lineups of the nine players can be made for a baseball team if the catcher bats first, the shortstop second, and the pitcher last?
*August 12, 2009 by Twg*

**chem**

I am having a hard time with the following : 50 g HCl + 50g Ca(OH)2=H2O+? amt of CaCl2? I dont know how to set this prob. up.Please HELP!Thank you in advance....
*November 12, 2010 by joann*

**mathematic**

a bag contains 3rdmarbles, 2white and 3green a boy takes at one marble at random. what is the prob that it is either red or white?
*February 2, 2015 by joseph *

**Stat**

In statistic regressions, does "standard error" mean the residual (vertical distance of each point from teh regression line)?
*November 16, 2008 by Guy*

**Stat**

the teacher wants me to make a survey questions about a sample and get a statistical data from it, how? including variance and standard deveriation. thanks
*December 30, 2008 by Omar*

**Stat College**

what proportion of a normaql distribution is located between each of the following z- score boundaries? a. z= -0.50 and z = +0.50 b. z= - 0.90 and z= +0.90 c. z= -1.50 and z= +1.50 How will I know the question has been answered
*October 20, 2010 by John*

**HIT stat**

Present, in your own words, how information systems help support the risk management function of a healthcare organization
*June 10, 2013 by pj*

**statistic**

A power model is shown below. Determine the residual for the observed data x = 7 and y = 70. stat answer question 9 (1 point) 71.37 1.37 1.85 –1.37
*December 15, 2013 by helen*

**math prob**

Twelve people attend the first meeting of the Star Wars Club. They exchange e-mail addresses. How many exchanges take place?
*October 6, 2013 by Anonymous*

**Plz Help!I Need to find Hypotheses for prob.**

If 3x - 7 = -4, then x = 1. Write the hypotheses of this statement
*December 2, 2006 by Margie...*

**stat**

a sample of 150 adults is composed of 100 women and 50 men. estimate the standard error of the proportion for the female population
*November 9, 2010 by suzanne*

**stat**

a how to solve the problem when on 100 point examination with mean 60, SD 10, if there are 5% A, 5% F, 15% B, 15% D, and 60% C, find the scores that devide the distribution into those catagories.
*August 7, 2011 by B*

**stat**

Find the area under the standard normal curve to the left of z = 1.88, P(z < 1.88). (Give your answer correct to four decimal places.)
*July 7, 2012 by janet*

**math**

okay i am comepletely stuck on this math prob....: x + 5y - 10 = 0 x = 2y - 8 i know the answer is -20/7 , 18/7 but i have no idea how they got it so someone PLZ HELP!!!!
*February 26, 2008 by shelby*

**MATH Prob.**

What are the odds in favor of drawing a spade and a heart if drawing from a deck of cards w/o replacement?
*August 11, 2009 by Twg*

**Prob and Stats**

If X is a random variable with distribution X~N(350,110) find (a)P(X<400) and b)P(250<X<400)
*October 4, 2011 by Kathryn*

**algebra**

-720=x-9x plese explain to me how to do this prob step by step
*June 8, 2010 by Anonymous*

**MATH Prob.**

A box contains 13 white cards numbered 1 through13. List the sample space of the event choosing one card with a number greater than 6.
*August 8, 2009 by Twg*

**MATH Prob.**

Find the probability of correctly answering the first 4 questions on a multiple choice test if random guesses are made and each question has 3 possible answers.
*August 8, 2009 by Twg*

**MATH Prob.**

There are 8 members on a board of directors. If they must form a subcommittee of 3 members, how many different subcommittees are possible?
*August 20, 2009 by Twg*