Saturday

April 25, 2015

April 25, 2015

Number of results: 70,336

**Math**

Assume that the probability is 1/2 that a baby born is a boy. If a couple has two children, what is the probability that both are girls? Assume that births are independent of each other.
*February 21, 2010 by Lyndse*

**statistics**

Ignoring twins and other mutiple births, assume babies born at a hospital are independent events with the probability that a baby is a boy and the probability that a baby is a girl both equal to 0.5. Referring to the information above, the probability that at least one of the ...
*September 19, 2007 by Anonymous*

**math**

A couple intends to have four children. Assume that having a boy and girl is equally likely event. a) List sample space b) Find the probability that couple has two boys and two girls; c) Find the probability that couple has at least one boy
*January 23, 2012 by juan777*

**stats**

Find the probability of at least 2 girls in 10 births. Assume that male and female births are equally likely and that the births are independent events.
*March 16, 2015 by Greg*

**biology**

A couple has four children. What is the probability that there will be 2 boys and 2 girls? Assume that no outside forces influence the births.
*November 19, 2008 by katt0109*

**statistics**

3. A couple is planning on having four children. Assume that the probabilities of the man fathering a boy or a girl are .50 and .50, respectively. What is the probability that a. exactly two will be boys, b. fewer than two will be boys, and c. more than one will be a boy? ...
*June 7, 2013 by Lynn*

**maths**

Hi Can anyone help please: Suppose that the births of boys and girls can be modelled by rollling a fair die with 27 faces, 14 of which represent a boy and 13 represent a girl. 1. Using this model, choose the option that is closest to the probability that a couple who continue ...
*March 14, 2011 by Claire*

**probability**

a couple is planning to have three children. Find the probability that the couple will have: a.) 2 girls and 1 boy? b.) 2 girls followed by a boy? c.) at least 1 girl? please answer my question thank you very much, have a good day!
*September 21, 2012 by nitz*

**maths**

Hi Can anyone help please: Suppose that the births of boys and girls can be modelled by rollling a fair die with 27 faces, 14 of which represent a boy and 13 represent a girl. 1. Using this model, choose the option that is closest to the probability that a couple who continue ...
*March 16, 2011 by Claire*

**Statistics**

Supposed (as is roughly correct) that each child born is equally likely to be a boy or a girl and that sexes of successive children are independent. If we let BG mean that the older child is a boy, and the younger child is a girl, then each of the combinations BB, BG, GB, GG ...
*May 28, 2011 by Chelsea*

**math**

Assuming boy and girl babies are equally likely, find the probability that it would take a) at least three births to obtain two girls b) at least four births to obtain two girls c) at least five births to obtain two girls
*November 15, 2012 by Andrew*

**math**

Assuming boy and girl babies are equally likely, find the probability that it would take a) at least three births to obtain two girls b) at least four births to obtain two girls c) at least five births to obtain two girls
*November 16, 2012 by Andrew*

**Statistics**

Assume that male and female births are equally likely and that the birth of any child does not affect the probability of the gender of any other children. Find the probability of exactly eight in ten births.
*March 13, 2011 by chalulu*

**Probability**

I have two children. One of them is a boy born on a Tuesday. What is the probability they are both boys?
*August 30, 2010 by Diane*

**math**

Suppose that China’s population policy is modified so that every family could have children until either a boy is born or until a maximum of four children are born, whichever comes first. Assume that every family chooses to have as many children as possible under this policy, ...
*May 11, 2013 by emma*

**Statistics**

Suppose you conduct a study and find that the probability of having a baby boy is 60%. Now suppose three of your relatives are going to have babies. a) Build a tree diagram showing all the conditional probabilities and joint probabilities associated with the sex of the three ...
*May 10, 2008 by Danny*

**Statistics**

Suppose you conduct a study and find that the probability of having a baby boy is 60%. Now suppose three of your relatives are going to have babies. a) Build a tree diagram showing all the conditional probabilities and joint probabilities associated with the sex of the three ...
*May 11, 2008 by Danny*

**statistics**

Define each of the following probability terms for the scenario of determining the probability that when a couple has 3 children, they will have exactly 2 boys. Assume that boys and girls are equally likely and that the gender of any child is not influenced by the gender of ...
*September 6, 2014 by thankyou*

**odds of...**

Does anyone know the odds of having Two girls as children as opposed to two males or one male and one female? I say it is 25 percent but my friend says it is 33.3 percent. Can anyone clarify? Thanks! You are correct. Assuming tht boy and girls are equally probable each time, ...
*August 8, 2005 by Lynn*

**Math 157**

assume that a reseacher randomly selected 14 new born babies and counts the number of girls selected x. the probability corresponding to the 14 possible values of x. find the probability of selecting exactly 8 girls.
*March 12, 2011 by Anonymous*

**Statistics**

A study shows that the probability of a baby being born with gene x is 0.6. The probability of a baby being born with gene y is 0.7. (a)What is the probability of being born with both genes assuming that the probabilities are independent? (b)In fact; 90% of those born with ...
*August 17, 2011 by waqas*

**statistics**

Let the random variable x represent the number of girls in a family with three children. Assume the probability of a child being a girl is 0.46. The table describes the probability of having x number of girls.Determine whether the table describes a probability distribution. If...
*February 18, 2015 by slomomo*

**statistics**

Let the random variable x represent the number of girls in a family with three children. Assume the probability of a child being a girl is 0.42. The table on the right describes the probability of having x number of girls. Determine whether the table describes a probability ...
*February 20, 2015 by slomomo*

**Math**

Assume the probability is 1/2 that a child born is a girl. If a family has three children, what is the probability that they have a) exactly one girl b) at most two boys?
*January 10, 2011 by Nicole*

**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*

**stats.**

Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US woman ( Chance, Spring 2001). Gestation length has mean of 280 days with a standard deviation of 20 days. a. Find the ...
*March 17, 2013 by Lindsey please help*

**statistics**

Based on data from the National Center for Health Statistics, N. Wetzel used the normal distribution to model the length of gestation for pregnant US woman ( Chance, Spring 2001). Gestation length has mean of 280 days with a standard deviation of 20 days. a. Find the ...
*March 17, 2013 by lindsey*

**mathematics**

Consider the composition of a three-child family. Assume that a girl is as likely as a boy at each birth. What is the probability that there is one boy and two girls in the family?
*February 20, 2011 by Anonymous*

**check math**

If boys ad girls are equally likely to be born, what is the probability that in a randomly selected family of eight children, there will be at least one a boy. Answer 0.984
*June 1, 2013 by Sue*

**Math**

A newly married couple expected a boy and a girl or four children, occuring boy or girl has equal probability. Find the probability of success of their expectations.
*January 2, 2015 by Chathu*

**Math**

In a family with two children, what are the probabilities of the following outcomes, assuming that the birth of boys and girls is equally likely? a. Both are boys. b. The first is a girl and the second a boy. c. Neither is a girl. d. At least one is a girl. I was wondering ...
*November 18, 2009 by Punkie*

**math**

What is the probability that exactly three children in a family of five children will be boys? Assume that P(boy)=P(girl)
*March 9, 2010 by Andrew*

**Quantitative Methods**

Assume you have applied to two different universities (lets refer to them as Universities A and B) for your graduate program. In the past 25% of students (with similar credentials as yours) who applied to University A were accepted, while University B accepted 35% of the ...
*March 18, 2009 by V*

**Quantitative Methods**

Assume you have applied to two different universities (lets refer to them as Universities A and B) for your graduate program. In the past 25% of students (with similar credentials as yours) who applied to University A were accepted, while University B accepted 35% of the ...
*March 19, 2009 by V*

**Science**

Two parents have three children. They have two girls and one boy. What is the probability that the next child will be a boy?
*April 8, 2013 by Bobby*

**Probability**

A binary communication system is used to send one of two messages: (i) message A is sent with probability 2/3, and consists of an infinite sequence of zeroes, (ii) message B is sent with probability 1/3, and consists of an infinite sequence of ones. The ith received bit is “...
*March 7, 2015 by qwerty*

**satistics **

assume the probability that an electronic device will have a type 1 defect is 1% and the probability that it will have a type 2 defect is 2%. given that these two defects are not independent ,what is the probability that an item randomly selected has both a type 1 and type 2 ...
*February 27, 2013 by natalie *

**math**

Chances are 50-50 that a newborn baby will be a girl. For families with five children, what is the probability that all the children are girls
*November 24, 2012 by joe*

**statistics**

If boys and girls are equally likely to be born, what is the probability that in a randomly selected family of 6 children, there will be at least one boy? (Find the answer using a formula. Round your answer to three decimal places.)
*March 30, 2014 by jose*

**Math**

If boys and girls are equally likely to be born, what is the probability that in a randomly selected family of 8 children, there will be at least one boy? (Find the answer using a formula. Give your answer correct to three decimal places.)
*June 6, 2013 by Nora 59*

**Statistics**

On a very short quiz, there is one multiple choice question with 5 possible choices (a, b, c, d, e) and one true or false question. Assume you are taking the quiz but do not have any idea what the correct answer is to either question. You mark an answer to each question anyway...
*July 8, 2011 by Cassie*

**math**

You meet a woman who tells you. "I have two children. One of them is a boy." What is the probability that both children are boys?
*March 29, 2011 by Jamie*

**math**

A couple has 4 children ages 9,6,4,and 1.What is the probability that they are all girls.
*January 25, 2012 by Amina*

**arithmetic**

Assume you roll a fair dice twice. Two rolls are independent and identically distributed, with probability of rolling a particular number being 1/6. So, for instance, the probability of rolling 5 and then 2 is P(5,2) = P(5) ⋅ P(2) = 1/6 ⋅ 1/6 = 1/36 Consider a ...
*June 1, 2013 by Anonymous*

**maths**

1. A die labelled A has one face marked 1, one face marked 2 and the other four faces marked 3. A die labelled B has four faces marked 2 and two faces marked 3. The dice A and B are thrown. Calculate the probability is 5. I got 18/36 2. There are 12 boys and 20 girls in a ...
*June 3, 2009 by Anonymous*

**bio**

The probability that their baby will be a carrier of the gene for PKU is (A) ___3/4_______. The probability that their baby will be affected by PKU is (B) __________. If both genotypes were Pp, the probability that their baby would be affected by PKU would be (C) ___1/4______...
*May 30, 2014 by carrie*

**Math (Q#2)**

Even though tetanus is rare in the United States, it is fatal 70% of the time. If three persons contract tetanus during one year, what is the probability that none of the three will die. Assume that fatalities due to tetanus are independent of each other. If they are ...
*October 2, 2006 by Lindz*

**Biology**

In man, muscular dustrophy , is inherited as a sex linked recessive , a couple , both of whom are normal, have five children, three boys and two girls , the oldest boy is beginning to show symptoms of the disease, what could you tell them about the chances of their children ...
*October 26, 2011 by Melissa*

**probability**

For a family with 2 children, the sample space indicating boy (B) or girl (G) is BB, BG, GB, and GG. If each of the outcomes is equally likely, find the probability that the family has 2 girls, given that the first child is a girl.
*July 6, 2013 by sarah*

**Statistics**

If a couple has 4 children and none are from multiple births or twins. With the probability of sons being 50% how many sons would they expect to have?
*July 4, 2014 by Denise*

**Math**

An upscale department offers its customers free gift wrapping on any day that they spend at least $100. The store offers 5 box sizes (XS, S, M, L, XL), 6 wrapping themes (birthday, wedding, baby girl, baby boy, anniversary, and all-occasion), and 3 styles of bow (classic, ...
*February 19, 2008 by Mike*

**Statistics **

1. A human gene carries a certain disease from a mother to her child with a probability rate of 0.58. That is, there is a 58% chance that the child becomes infected with the disease. Suppose a female carrier of the gene has five children. Assume that the infections, or lack ...
*September 29, 2013 by Lisa *

**statistics**

If the probability of running out of gas is .03 and the probability the electronic starting system will not work is .01 a.) what is the probability there will be enough gas and that the starting system will work? assume the two events are independent b.) when may independence ...
*September 2, 2011 by kkg*

**college math**

A couple plan to have exactly three children. (a) Construct a tree diagram and list the sample space. (b) Find the probability that the family has at least two girls.
*December 11, 2007 by Rose*

**statistics**

In 1980 (before the era of in-vitro fertilization), there were 3,612,258 births in the United States (according to the U.S. Census Bureau), of which 68,339 births were to twins and 1,337 births were to triplets or more. What was the probability of having multiples (twins or ...
*June 19, 2013 by f*

**Math**

Alberto figures that the probability of his hockey team winning on saturday is 65%. Alvin figures that the probability of his basketball team winning on saturday is 70%. Assume that the events are independent and that the boys estimates of the probability are accurate A. Find ...
*March 8, 2012 by Mik*

**statistics**

For any married couple who are members of a squash club, the probability that the husband has a degree is 2/4 and the probability that the wife has a degree is 1/4. The probability that the husband has a degree given that his wife has a degree is 3/9. A married couple is ...
*December 3, 2011 by Nabiha*

**help... probability**

The Smith family has 4 children that are all girls. What is the probability that the next one will be a girl? You plan on having four children and you want all boys. If you have children, what is the probability you will get four boys?
*October 16, 2007 by maggie r*

**statistics**

Your best friend is 5 months pregnant and wants you to be there when the baby is born. Since the baby was conceived on Labor Day, the delivery might coincide with your annual trip to cabo. the doctor tells you that the gestation period for humans is normally distributed with a...
*February 17, 2008 by lauren*

**Math - Probability**

in a primary school 70% of the boys and 55% of the girls can ride a bicycle. if a boy or a girl are chosen at random, what is the probability that both of them can ride a bicycle?
*May 13, 2013 by donald*

**statistics**

A clinical trial test a method designed to increase probability of conceiving a girl.In study 375 were born and 300 were girls Use sample data to construct 99%confidence interval of percentage girls born
*March 17, 2014 by Martha*

**math**

35 yrs ago babies are born here hospital celebrated the births of the last baby of feb 20th and the 1st baby of feb 21st w/gifts. 5 mothers including mrs keating were in labor as of midnight find the full name of each newborn 1 of the 1st name is crystal can you figure the ...
*February 21, 2008 by latisha*

**Math/157**

A human gene carries a certain disease from the mother to the child with a probability rate of 53%. That is, there is a 53% chance that the child becomes infected with the disease. Suppose a female carrier of the gene has three children. Assume that the infections of the three...
*March 20, 2010 by anony*

**probability**

n 1980 (before the era of in-vitro fertilization), there were 3,612,258 births in the United States (according to the U.S. Census Bureau), of which 68,339 births were to twins and 1,337 births were to triplets or more. What was the probability of having multiples (twins or ...
*July 2, 2013 by Karthik*

**Math**

Hi can someone help assist me with my math problems dealing with probability If 80% of scheduled flights actually take place and cancellations are independent events, what is the probability that 3 separate flights will all take place? A) 0.51 B) 0.01 C) 0.64 D) 0.80 ...
*April 2, 2010 by Hannah*

**maths-probability**

A family has four children. The probability of having a girl is 1/2. What is the probability of having 2 girls followed by 2 boys?
*April 16, 2008 by louis*

**arithmetic**

Assume you roll a fair dice twice. Two rolls are independent and identically distributed, with probability of rolling a particular number being 1/6. So, for instance, the probability of rolling 5 and then 2 is P(5,2) = P(5) ⋅ P(2) = 1/6 ⋅ 1/6 = 1/36 Consider a ...
*June 1, 2013 by Anonymous*

**biology Please Help**

The probability that their baby will be a carrier of the gene for PKU is (A) __________. The probability that their baby will be affected by PKU is (B) __________. If both genotypes were Pp, the probability that their baby would be affected by PKU would be (C) _________. my ...
*June 1, 2014 by Stacy*

**Probability**

Consider the communication network shown in the figure below and suppose that each link can fail with probability p. Assume that failures of different links are independent. Assume that p=1/3. Find the probability that there exists a path from A to B along which no link has ...
*February 16, 2015 by qwerty*

**Math**

I am doing an assignment on probability. It sais.. "By the start of the 21st century, only 1 in 6 babies in America was born with blue eyes. What is the probability that at least 1 out of 2 babies has blue eyes? And then it sais " What might be a good model for simulating the ...
*June 1, 2013 by Kortny*

**Probability**

You have a blind date with a physics major. From your social networking experience, you know that 10% of physics majors are immature, 50% are narcissistic, and 90% are boring. Assume that immaturity, narcissism, and boringness are independent events. Calculate the probability ...
*November 23, 2014 by Anonymous*

**Math**

If the probability that a certain tennis player will serve an ace is 1/4, what is the probability that he will serve exactly two aces out of four serves? (Assume that the four serves are independent. Round your answer to four decimal places.)
*January 27, 2013 by Bersy*

**Probability Math **

Event A has probability of 0.2 and event B has probability of 0.3. If they are independent, what is the probability that both of them happen? I can't remember how to do this one.
*September 29, 2013 by Alex*

**Statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 320 babies were born, and 256 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the results, ...
*June 30, 2014 by Kasey*

**statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 395 babies were born, and 316 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, ...
*March 13, 2015 by slomomo*

**science**

A normal man and a heterozygous color blind "carrier" woman have a baby. If they have a girl, what is the probability that the girl will be colorblind. If they have a boy, what is the probability that the boy will be colorblind?
*December 18, 2012 by kelly*

**statistics-PLEASE HELP quick**

A family has four children and we assume that births occur with equal frequency for both sexes. Construct a sample space for all possible family arrangements allowing for order of birth to count. a) How many different arrangements are possible? b)find P (three are boys)= c)...
*December 16, 2013 by Amy*

**Statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study 624 babies were born, and 312 of them were girls. Use the sample data to construct a 99% confidence interval estimate of the percentage of girls born. Based on the result, ...
*February 12, 2014 by Stephanie*

**Math 132**

There are 7 girls and 6 boys in a class. Suppose five children are randomly chosen to decorate the game room. Given that at least one boy is chosen, what is the probability that exactly two boys are chosen?
*April 5, 2010 by Jess*

**Algebra 2 - stats and probability**

I need someone to tell me how to set these up please? 1. A box contains 4 quarters. 2 of the quarters have the American eagle on the back. Suppose you draw 2 quarters at random with replacement. a. What's the probability that both have the American eagle on the back? b. What's...
*May 13, 2009 by Kay*

**Probability**

three fair dice are tossed. Let X,Y,Z denote the respetive numbers showing on their top faces. Assume X,Y,Z are independent. a) find P(X<Y) b) Show that the events (X<Y) and (Y<Z) are NOT independent heeelp...
*November 18, 2007 by Danny*

**Statistics**

In planning a family of 4 children assume boys and girls are equally likely on each birth. Find (i) the probability distribution (ii) the expected number of boys (iii) the standard deviation of the number of boys.
*March 17, 2011 by Donald Crentsil*

**Economics/Math**

1. Assume that q and z are two random variables that are perfectly positively correlated. q takes the value of 20 with probability 0.5 and the value of zero with probability 0.5, while z takes the value of 10 with probability 0.5 and the value of zero with probability 0.5. ...
*December 5, 2009 by Susan*

**Statistics**

A clinical trial tests a method designed to increase the probability of conceiving a girl. In the study, 449 babies were born, and 250 of them were girls. Use the sample data with .01 significance level to test the claim that with this method, the probability of a baby being a...
*November 26, 2013 by Help Please! *

**Finite math**

A newly married couple decides to keep having children until they have a girl. What is the probability that the couple will have at least 5 children?
*May 3, 2012 by MV*

**Help????????????????????/**

Assume a family is planning to have three children. A. What is is the probablity of a family having 2 girls. B. The probablity of a family having at least 1 boy. C. List the sample space using a B for Boy and G for girl (Hint there should be 8 possible outcomes).
*April 26, 2013 by Angela*

**Math: Is my answer correct?**

I am not sure how to do this, just guesssing. A couple has a 2/3 probability of passing on brown eyes to their children. If they have four children, what is the probability that none of the children will have brown eyes? A) 8/27 B) 1/27 C) 1/81 D) 16/81 Would I multiply 2/3^4 ...
*May 2, 2010 by bwb*

**Probability**

A binary communication system is used to send one of two messages: (i) message A is sent with probability 2/3, and consists of an infinite sequence of zeroes, (ii) message B is sent with probability 1/3, and consists of an infinite sequence of ones. The ith received bit is “...
*March 6, 2015 by John*

**math/probability**

For some reason I can not get my head around probability. Please show me how to work the problem not just the answers. A class has 11 students who are to be assigned seating by lot. What is the probability that the students will be arranged in order from shortest to tallest? (...
*July 24, 2010 by Jaime*

**probability**

Two six-sided dice each have the numbers 1 through 6 on their faces. Neither die is fair, but they are both weighted the same. The probability of rolling a certain number on one die is given in the table below: # 1 2 3 4 5 6 probability 1/6 1/6 1/9 ? 2/9 ? If the probability ...
*March 8, 2013 by Anonymous*

**probability**

Let Č be the bias of a coin, i.e., the probability of Heads at each toss. We assume that Č is uniformly distributed on [0,1]. Let K be the number of Heads in 9 independent tosses. By performing some fancy and very precise measurements on the structure of that particular coin, ...
*April 14, 2015 by alec*

**Economics/Statistics**

1. Assume that q and z are two random variables that are perfectly positively correlated. q takes the value of 20 with probability 0.5 and the value of zero with probability 0.5, while z takes the value of 10 with probability 0.5 and the value of zero with probability 0.5. ...
*December 6, 2009 by Susan*

**Math**

10. A coin is loaded so that the probability of heads is 0.55 and the probability of tails is 0.45, Suppose the coin is tossed twice and the results of tosses are independent. a.What is the probability of obtaining exactly two heads? b.What is the probability of obtaining no ...
*March 2, 2014 by Renee*

**Math-probablity**

Assume a family is planning to have three children. A. What is is the probablity of a family having 2 girls. B. The probablity of a family having at least 1 boy. C. List the sample space using a B for Boy and G for girl (Hint there should be 8 possible outcomes).
*April 26, 2013 by Angela*

**math probablity**

Assume a family is planning to have three children. A. What is is the probablity of a family having 2 girls. B. The probablity of a family having at least 1 boy. C. List the sample space using a B for Boy and G for girl (Hint there should be 8 possible outcomes). ??????
*April 26, 2013 by Angela*

**Stats (probability)**

Of 10 girls in a class, 3 have blue eyes. If two girls are chosen at random, what is the probability that (i) both have blue eyes, (ii) neither has blue eyes, (iii) at least one has blue eyes? I have the answers but do not know how to get them. I'm trying to use a tree diagram...
*March 16, 2011 by Morgan*

**Probability**

Let Θ be an unknown random variable that we wish to estimate. It has a prior distribution with mean 1 and variance 2. Let W be a noise term, another unknown random variable with mean 3 and variance 5. Assume that Θ and W are independent. We have two different ...
*April 20, 2014 by A*

**math**

Two representatives are chosen at random from a group of 100 students that has 50 girls and 50 boys. What is the probability that the representatives seledted are either both boys or both girls?
*March 13, 2012 by karen*

**Statistics**

Assume that a procedure yields a binomial distribution with n=3 trials and a probability of success of p= 0.90. Use a binomial probability table to find the probability that the number of successes x is exactly 1.
*December 2, 2014 by Angel*

**Probability**

Suppose that the probability is 1 in 3,900,000 that a single auto trip in the United States will result in the death of the driver. Over a lifetime, an average U.S. driver takes 50,000 trips. Assume that events are independent: (a) What is the probability of such a driver ...
*October 25, 2010 by Laura*