Saturday

January 31, 2015

January 31, 2015

Number of results: 35,383

**Probability **

Suppose that an unfair coin comes up heads 54.1% of the time. The coin is flipped a total of 13 times. a) What is the probability that you get exactly 6 heads? b) What is the probability that you get exactly 6 tails? c) What is the probability that you get at most 9 tails?
*February 24, 2012 by Vikki*

**math**

Carolyn tested a coin to see if it was evenly weighted. She flipped the coin 100 times and came up with 42 heads and 58 tails. How does the relative frequency of tails to heads compare to the probability of tails in this experiment? A. The relative frequency is the same as the...
*June 8, 2013 by bubbie*

**probability**

Suppose an unfair coin comes up heads 52.2% of the time if it is flipped. If the coin is flipped 26 times, what is the probability that: a) it comes up tails exactly 12 times? b) it comes up heads more than 22 times?
*March 21, 2012 by Sam*

**statistics**

air coin is flipped 20 times. a. Determine the probability that the coin comes up tails exactly 15 times. b. Find the probability that the coin comes up tails at least 15 times. c. Find the mean and standard deviation for the random variable X giving the number of tails in ...
*September 23, 2013 by nneamaka*

**probability**

You flip a fair coin (i.e., the probability of obtaining Heads is 1/2) three times. Assume that all sequences of coin flip results, of length 3, are equally likely. Determine the probability of each of the following events. {HHH}: 3 Heads incorrect {HTH}: the sequence Heads, ...
*February 7, 2014 by JuanPro*

**math**

In a game, a player tosses a coin 4 times. If the player gets 3 or 4 heads, he/she wins. What is the theoretical probability of winning this game? I just need to know the outcomes. I don't know how to get them. Please and Thank you. Coin 1: 50% Heads Coin 2: 50% Heads Coin 3: ...
*May 30, 2007 by Angela*

**finite**

Assume that the coin is flipped 10 times. What is the probability that both heads and tails occur?
*February 19, 2012 by victoria*

**math**

Assume that the coin is flipped 10 times. What is the probability that both heads and tails occur?
*February 20, 2012 by victoria*

**math**

a girl flipped a coin 4 times, what is the probability that she gets 3 heads and 1 tails? Using a tree diagram
*March 7, 2010 by Kevin*

**stor**

Suppose that you flip a fair coin (P(H)=P(T)=1 2 ) three times and you record if it landed on heads, H, or tails, T. (a) What is the sample space of this experiment? What is the probability of each event? (b) [1 pt] Let X be the number of times that you observe heads. What ...
*September 29, 2012 by ami*

**Stat. **

A trick coin has been weighted so that heads occurs with a probability of p 2 3, and p(tails) 1 3. If you toss this coin 72 times, a. How many heads would you expect to get on average? b. What is the probability of getting more than 50 heads? c. What is the probability...
*January 27, 2013 by Nickie*

**Statistics**

Suppose Tori has an unfair coin which lands on Tails with probability 0.28 when flipped. If she flips the coin 10 times, find each of the following: Question 5 options: P(No more than 3 Tails) P(Exactly 1 Tail) P(At least 5 Tails) P(Less than or equal to 2 Tails) P(At least 1...
*June 2, 2013 by Anonymous*

**Statistics**

A loaded coin is tossed 5 times, find the probability distribution for the number of heads, if heads are thrice likely to occur than tails. Let x be the number of heads that will turn up. Compute the probability associated to each value of X using the equation: x=0,1,2,3,4,5 P...
*July 25, 2011 by Sapphire*

**Probability**

Find the probability of obtaining between 50 and 55 tails inclusive when a fair coin is flipped 80 times. (answer accurate to four decimal places.)
*November 22, 2009 by Anna*

**Statistics**

A coin is tossed five times. Find the probability of getting four tails. I realize that getting four tails is the exact same thing as getting only one heads, but how would you figure out this problem using probability rules? Thanks for your time, I appreciate it :]
*January 2, 2011 by Emily*

**math**

Kalil flipped a coin sixty times. He got thirty-four heads. How does this result compare to the number of heads you would have expected based on theoretical probability?
*July 18, 2013 by zach*

**Math: Probablity**

A penny, a nickel, and a dime are flipped at the same time. Each coin can come out either heads (H) or tails (T). a. What name is given to the act of flipping the coins? b. There are eight elements in the sample space (i.e., HHH,THT, etc.). List all eight outcomes. c. How many...
*February 15, 2014 by Anonymous*

**Statistics**

You are shown a coin that its owner says is fair in the sense that it will produce the same number of heads and tails when flipped a very large number of times. Suppose you decide to flip a coin 100 times. a. What conclusion would you be likely to draw if you observed 95 heads...
*September 19, 2010 by Rhea*

**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**

Suppose you toss a coin and it you win a dollar if it comes up heads. If it comes up tails you toss the coin again. This time you get two dollars if it is heads. If it is tails you toss it again. This time you win four dollars if it is heads, but if it is tails you toss it ...
*October 31, 2008 by brianne*

**math-probability**

A student claims that if a fair coin is tossed and comes up heads 5 times in a row, then, according to the law of averages, the probability of tails on the next toss is greater than the probability of heads. What is your reply?
*April 19, 2010 by jennifer*

**Statistics and Probability**

One six-sided fair die is rolled, and one two-sided fair coin is tossed. If the coin turns up heads, then the number of spots showing on the die is the value (score) for that trial. If the coin is tails then twice the number of spots showing on the die is the value (score) for...
*December 16, 2010 by Laura*

**Finite Math**

A coin is loaded, so that the probability of a head occuring on a single toss is 2/3. In six tosses of the coin, what is the probability of getting all heads or all tails?
*September 27, 2012 by Carol*

**Math Problem ( 6th grade math)**

Brandon tosses a coin 500 times. The coin lands on tails 320 times. A: What is the experamental probability of getting heads? B: Is the coin fair or unfair? Explain you answer.
*May 16, 2012 by Anna*

**math**

a student claims that if a fair coin is tossed and comes up heads 5 times in a row, then according to the law of averages the probability of tails on the next toss is greater than the probability of heads. What is your reply?
*January 31, 2010 by Charles*

**math**

A student claims that if a fair coin is tossed and comes up heads 5 times in a row, then, according to the law of averages, the probability of tails on the next toss is greater than the probability of heads. What is your reply?
*April 20, 2010 by crystal*

**Math**

Would you be more likely to get at least 70% tails if you flip a fair coin 10 times or if you flip a fair coin 1000 times? A) You would be more likely to get at least 70% tails if you flip a fair coin 10 times than if you flip a fair coin 1000 times. B) The probability of ...
*April 4, 2010 by Nicole*

**finite math**

Suppose a coin is tossed 100 times 57 heads and 43 tails what is the probability the next one will be heads.
*June 17, 2014 by carol*

**Theoretical&Experimental Probability please help!**

Please check my work thanks!! A number cube with the numbers 1 through 6 is rolled. Find the given probability. 1. P(number < 2) (1 point) A. 1/6 <--- i think this one B. 2/6 C. 4/6 D. 3/6 2. P(number ≥ 3) (1 point) A. 4/6 B. 1/6 C. 2/6 <-- this i think D. 5/6 ...
*March 6, 2013 by Matthew*

**Statistics**

A coin was flipped 60 times and came up heads 38 times. (a)at the .10 level of significance, is the coin biased towards heads? Show your decision rule and calculations. (b) calculate a p-value and interpret it.
*June 8, 2008 by Gayla*

**Statistics**

A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it
*June 6, 2010 by Robert*

**Word Problem**

A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.
*September 28, 2008 by Marilyn*

**algebra**

A coin is tossed 3 times. Find the probability of obtaining the following: a) heads on the first and last toss, and tails on the other toss b) at least 2 heads c) at most 2 heads
*July 7, 2013 by Eliza*

**MATH**

an unfair coin with pr[tails]= .15 is flipped 6 times. what is the probability of getting EXACTLY 1 tail in the 6 flips?
*October 18, 2012 by Anonymous*

**probability**

if a fair coin is tossed 4 times, what is the probability of getting heads the first 3 times, and tails the fourth itme?
*May 10, 2011 by kristy*

**Finite! please help**

an unfair coin with pr[tails]= .15 is flipped 6 times. what is the probability of getting AT LEAST 1 tail in the 6 flips?
*October 18, 2012 by Anonymous*

**Intro to Probability, please check my work.**

A fair coin is flipped three times. You win $5 every time the outcome is heads. Let the random variable X represent the total number of dollars you win. (a) List the sample space. (b) Determine the probability function of X. ====================== Answer: a) 2^3= 8 ...
*February 17, 2008 by Amelie*

**arithmetic**

Assume you have an unfair coin - the one that lands heads with probability P (not known beforehand). You have rolled such a coin 20 times and got 16 heads and 4 tails. What is the best estimator of P, Pˆ? (Hint: it is the one based on sample mean.)
*June 1, 2013 by Anonymous*

**math**

if freddy tosses a coin three times, what is the probability that the coin will turn up hesds,tails,heads, tails in that order? I came up with 1/2 correct? also the ratio length to the width of the alamo isabout 5to 3 if the width of the alamo is 63ft about how long is the ...
*May 17, 2011 by jill*

**Probability**

* I have a question. The sentence below says, "A PENNY, a NICKEL, and a DIME are flipped....." Does this go in order? That is,.....for example: (H,T,H)The first H is for PENNY, the T is for NICKEL, and the last H is for DIME? A penny, a nickel, and a dime are flipped at the ...
*February 15, 2014 by Anonymous*

**statistics**

A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. I need more than the answer. I'm looking for help on the steps to get to the answer, please. Thanks
*December 1, 2011 by Laura*

**probability**

urgent till 3 pm i have in colombia¡ 1 Alice has five coins in a bag: two coins are normal (i.e., fair with one face Heads and the other face Tails), two are double-headed (i.e., both sides are Heads), and the last one is double-tailed (i.e., both sides are Tails). She reaches...
*March 11, 2014 by Sakura1*

**math**

A student claims that if a fair coin is tossed and comes up heads 5 times in a row, then, according to the law of averages, the probability of tails on the next toss is greater than the probability of heads. What is your reply? would this be the answer No matter what comes up ...
*April 21, 2010 by crystal*

**Probability**

Alice has five coins in a bag: two coins are normal (i.e., fair with one face Heads and the other face Tails), two are double-headed (i.e., both sides are Heads), and the last one is double-tailed (i.e., both sides are Tails). She reaches into the bag and randomly pulls out a ...
*March 7, 2014 by qwerty*

** Math**

A coin is loaded in such way that a tail is three times as likely to occur as a head. If the coin is flipped twice. Find the probability that two heads occur
*November 1, 2013 by Elizabeth*

**Math**

A coin is loaded in such way that a tail is three times as likely to occur as a head. If the coin is flipped twice. Find the probability that two heads occur
*November 1, 2013 by Elizabeth*

**Math**

A coin is loaded in such way that a tail is three times as likely to occur as a head. If the coin is flipped twice. Find the probability that two heads occur
*November 2, 2013 by Elizabeth*

**Math**

Four coins fall onto the floor. Find the probability that (a) exactly three coins land heads up (b) all coins land tails up (c) two or more coins land heads up (d) no more than two coins land tails up (e) at least one coin lands tails up
*June 18, 2014 by Shelagh*

**maths**

Suppose there are 10 coins laid out in front of you. All of the coins are fair (i.e. have an equal chance of heads or tails) except one, which flips to heads every time. You draw one coin at random and flip it 5 times. If each of the 5 flips results in heads, then the ...
*March 26, 2013 by sana*

**Probabilty**

Biased coin has a 0.4 probability of landing on tails. The random variable x, based on a single toss of the coin, is defined as follows: x=0 if heads appears; x=1 if tails appears. What Is the mean value of X? Is it . 0.3 .4 .6 .5 .7
*November 28, 2012 by Gilbert*

**Math **

we have 2 coins: coin 1 comes up with the probability of tails of 2/3 while coin 2 comes up with the probability of tails of 1/3 you dont know which is which so you pick one up at random and flip it . If its tails, you guess that the coin you picked up is coin 1 else you guess...
*January 19, 2015 by Jake*

**PRE-CALC**

A biased coin has a 0.4 probability of landing on tails. The random variable X, based on a single toss of the coin, is defined as follows: X = 0 if heads appears; X = 1 if tails appears. What is the mean value of X? A) 0.7 B) 0.5 C) 0.4 D) 0.3 E) 0.6
*March 24, 2014 by Anonymous*

**math**

Six fair coins are flipped, the probability that exactly three coins turns up heads is T. If the coins are flipped again, the probability that exactly 16T coins turns up heads is S. If the six coins are flipped again, the probability that exactly 32S coins turns up heads is Q...
*November 7, 2010 by zid*

**Data Management**

A random variable X is defined as the number of heads observed when a coin is tossed 4 times. Make a chart that shows the probability distribution for X. What is the expected value?
*January 21, 2014 by Alejandro*

**probability**

A fair coin is flipped independently until the first Heads is observed. Let K be the number of Tails observed before the first Heads (note that K is a random variable). For k=0,1,2,…,K, let Xk be a continuous random variable that is uniform over the interval [0,3]. The Xk's ...
*March 28, 2014 by JuanPro*

**math**

Three pennies are tossed into the air.What is the probability they will match either heads-heads-heads or tails-tails-tails when they land?
*February 22, 2012 by john *

**math**

francisco tossed the coin 10 more times. he got 5 heads and 5 tails. now what i his exrimental probability of getting heads? Wouldn't it depend on the tosses before? 50/50 with each flip. It has no revalence what the last flip or flips were.
*May 11, 2007 by brianna*

**sciences**

you and your partner are about to toss 2 coins 100 times. Predict about how many times the outcome woukd be. a. heads-heads b. heads-tails c. tails-heads d. tails-tails - My answer is 25% for each toss. you need to EXPLAIN your answer. HELP HELP HELP ME!
*March 29, 2009 by jouan*

**algebra I**

If you toss a coin, the probability of gettig heads is 1/2. If you toss a coin 2 times. the probability of getting heds each time is 1/2*1/2 or (1/2)^2. -Write an expression to represent the probability of tossing a coin 'n' times and getting 'n' heads. -Express your answer to...
*February 7, 2008 by Joanne*

**Math Statistics**

3. Suppose 20% of all heart transplant patients do not survive the operation. a. Think about taking repeated random samples of 371 patients from this population. Describe how the sample proportion who die would vary from sample to sample. (Hint: Be sure to refer to the shape, ...
*July 22, 2013 by TCaesar*

**math**

an unbiased coin is tossed six times. find the probability of the given event. the coin lands heads more than once.
*April 23, 2014 by Dee*

**math**

an unbiased coin is tossed six times. find the probability of the given event - the coin lands heads more than once.
*April 25, 2014 by Daren*

**Math**

What is the probability of obtaining at least one tail when a coin is flipped six times?
*December 12, 2008 by James*

**math**

A balanced coin is tossed 12 times and heads appears each time. What is the probability that tails will appear on the next toss?
*January 18, 2014 by n/a*

**math**

A balanced coin is tossed 12 times and heads appears each time. What is the probability that tails will appear on the next toss?
*January 22, 2015 by Gretchen*

**math $$**

ty sooooo much another question (sorry about all these just trying to get this done and learn it before tom.) Jennie calculated the probabilities of various events involving a coin. What is the probability of a coin landing on heads at least twice when the coin is flipped ...
*February 21, 2013 by Angie *

**finite math (probability**

suppose you toss a coin 100 times and get 57 heads and 43 tails. Based on the results what is the probability that the next toss will be head.
*June 17, 2014 by carol*

**Math (Statistics)**

Hi! Can someone help me with these two questions? Thanks a bunch! :) 1.) What causes experimental probability to match theoretical probability? In theory heads and tails occur 50/50. 2.) Find a way to estimate the time to flip a coin 10,000 times; 100,000 times.
*January 22, 2015 by Becky*

**Math (Statistics)**

Hi! Can someone help me with these two questions? Thanks a bunch! :) 1.) What causes experimental probability to match theoretical probability? In theory heads and tails occur 50/50. 2.) Find a way to estimate the time to flip a coin 10,000 times; 100,000 times.
*January 23, 2015 by Becky*

**Math. **

You repeatedly toss a fair coin for 5 times. What is the probability that heads comes up at least 3 times before tails comes up twice?
*November 1, 2013 by Elizabeth*

**Probability**

You toss a fair coin four times. Find the probability of no more than three heads given that at least one toss resulted in heads. Thank you very much!!
*January 27, 2012 by Erica*

**Probability**

What is the probability of flipping a coin two times and getting no heads? If I flip a coin twice and get no heads wouldn't it be 2/2 or 1?
*April 28, 2010 by bwb*

**maths**

I toss a coin 4 times. Find the chance of getting a) 2 heads b) more heads than tails
*April 27, 2013 by anonymous*

**prob and stats**

A coin is weighted so that the probability of obtaining a head in a single toss is 0.37. If the coin is tossed 27 times, find the following probabilities. Round your standard normal variable to two decimal places before using the table of values. (Give your answers to four ...
*October 15, 2010 by br0Ok3*

**math**

I flipped a coin 25 times. So since I got heads 15 times, does that mean that the percent of times i got heads is 60%? Yes or no
*July 28, 2013 by Anonymous*

**data management grade 12 **

Cecile tosses 5 coins,one after the other. a) How many different outcomes are possible? b) In how many ways will the first coin turn up heads and the last coin turn up tails? c) In how many ways will the second third and fourth coins all turn up heads? d) would the same ...
*February 5, 2010 by Paul*

**Data Management Help!**

A coin was tossed 1000 times in an experiment to decide whether it really had an equal chance of coming up heads or tails. The decision was made in advance to declare the coind NOT FAIR if the observed outcome of the experiment had less than a 5% chance of happening. Would the...
*June 7, 2008 by Jenna*

**Data management**

A coin was tossed 1000 times in an experiment to decide whether it really had an equal chance of coming up heads or tails. The decision was made in advance to declare the coind NOT FAIR if the observed outcome of the experiment had less than a 5% chance of happening. Would the...
*June 10, 2008 by Jenna*

**probability distribution**

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. P(head) + P(tail) = 1 P(head) = 3 P(tail) Solving gives: P(head) = 3/4 If we ...
*January 18, 2007 by queen*

**math**

Your friend is tossing a coin. He says that heads and tails are equally likey outcomes, so the probability of getting heads is 50/50. Explain your friends error.
*November 4, 2010 by Anonymous*

**Geometry**

A fair coin is flipped 3 times. The probability of getting exactly two heads, given that at least one flip results in a head, can be written as ab, where a and b are coprime positive integers. What is the value of a+b?
*June 10, 2013 by Abhishek Ranjan*

**math**

A fair coin is flipped 3 times. The probability of getting exactly two heads, given that at least one flip results in a head, can be written as a/b, where a and b are coprime positive integers. What is the value of a+b?
*June 11, 2013 by raja harishchandra*

**math**

A fair coin is flipped 3 times. The probability of getting exactly two heads, given that at least one flip results in a head, can be written as a/b, where a and b are coprime positive integers. What is the value of a+b?
*June 12, 2013 by raja harishchandra*

**math**

A fair coin is flipped 3 times. The probability of getting exactly two heads, given that at least one flip results in a head, can be written as a/b, where a and b are coprime positive integers. What is the value of a+b?
*June 13, 2013 by raja harishchandra*

**Math**

Before a football game, a coin toss is used to determine which team will kick off. The height h (in feet) of a coin above the ground t seconds after being flipped up into the air is given by the following equation. h = -16t2 + 34t + 15. How long does a team captain have to ...
*September 28, 2012 by Mark*

**TEST TOMM. NEED HELP IMMEDIATELY. PROBABILITY**

A fair coin is tossed ten times in a row. What is the probability that "heads" comes up at least eight times? I got an answer of 7/128, but I lost the paper with the work I showed. Can someone refresh my memory please?
*May 21, 2008 by Tom*

**Math**

1. When four fan coins are flipped what is the probability of getting either exactly two heads of exactly two tails? 2. Solve for x 3x-x√3=-6 3. In the figure below ABCD is a rectangle and DE=DC. Given Ad= 5 and BE=3 find DE Thanks!
*September 6, 2011 by Joe*

**Math**

"The probability of getting heads on a biased coin is 1/3. Sammy tosses the coin 3 times. Find the probability of getting two heads and one tail". I thought that all you have to do is: (1/3)(1/3)(2/3) It makes sense to me, but it's not right...
*May 3, 2010 by Stuck*

**math**

a fair coin is tossed in the air 4 times. if the coin lands heads up the first three tosses, what is the probability the coin will land heads up the fourth toss? I think it is 1/2 because the coin has 2 sides and 50% it will land on heads. My friend thinks it is 1/16, since ...
*May 12, 2013 by Ellie*

**MATH**

Suppose you toss a coin and will win $1 if it comes up heads. If it comes up tails, you toss again. This time you will receive $2 if it comes up heads. If it comes up tails, toss again. This time you will receive $4 if it comes up heads. Continue in this fashion for a total of...
*November 2, 2008 by Marie*

**Math**

Suppose you toss a coin and will win $1 if it comes up heads. If it comes up tails, you toss again. This time you will receive $2 if it comes up heads. If it comes up tails, toss again. This time you will receive $4 if it comes up heads. Continue in this fashion for a total of...
*November 2, 2008 by Diane*

**Math**

Emory tosses a nickle four times. The probability that he gets at least as many heads as tails is? Explain
*November 1, 2013 by Elizabeth*

**Math**

Someone tossed a coin 80 times.The coin landed on heads 60 times. Is the experimental probability greater than or less than theoretical probability?
*March 19, 2013 by Taya*

**Probability**

A coin is tossed 7 times. What is the probability of getting four heads. My teacher said that there is a formula involved but i don't know which one. How do i set it up?
*November 19, 2009 by nick*

**Probability**

Four Coins are tossed. Describe the sample space S, probability of getting more tails than heads and probability of getting at least two heads.
*June 22, 2014 by rosie*

**Math. Please help**

Emory tosses a nickle four times. The probability that he gets at least as many heads as tails is? Explain
*November 2, 2013 by Elizabeth*

**math**

a fair coin is flipped 5 times the random variable is x is defined to be the number of heads that are observed identify the probability mass function of the random variable x. x P(x)
*October 3, 2012 by virginia*

**Maths **

The probability of getting heads on a biased coin is 0.6. what is the probability of getting tails on this coin?
*January 10, 2015 by anonymous *

**Math**

Luis has a coin that is weighted so that the probability that Heads appears when it is tossed is 0.55. Suppose that the coin is tossed 3 times. What is the probability that all 3 tosses are Heads? please help ,e to solve this question . i dont'know if i +am right .55/2+.55/2+....
*February 17, 2012 by sajid*

**common fraction**

Sara tossed a fair coin five times, and Kaleb tossed a fair coin three times. There were five heads and three tails in the eight tosses. What is the probability that either Sara or Kaleb tossed exactly three heads? Express your answer as a common fraction.
*June 27, 2012 by Anonymous*

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