Questions

Trending now | today | this week | this month | newest
  1. probability

    For any given flight, an airline tries to sell as many tickets as possible. Suppose that on average, 10% of ticket holders fail to show up, all independent of one another. Knowing this, an airline will sell more tickets than there are seats available

  2. Probability

    We have a red coin, for which P(Heads)=0.4, a green coin, for which P(Heads)=0.5 and a yellow coin for which P(Heads)=0.6. The flips of the same or of different coins are independent. For each of the following situations, determine whether the random

  3. probability

    For each of the following sequences, determine the value to which it converges in probability. (a) Let X1,X2,… be independent continuous random variables, each uniformly distributed between −1 and 1. Let Ui=X1+X2+⋯+Xii,i=1,2,…. What value does the

  4. probability

    Let Sn be the number of successes in n independent Bernoulli trials, where the probability of success for each trial is 1/2. Provide a numerical value, to a precision of 3 decimal places, for each of the following limits. You may want to refer to the

  5. Probability

    Bias and MSE We estimate the unknown mean θ of a random variable X with unit variance by forming the sample mean Mn=(X1+⋯+Xn)/n of n i.i.d. samples Xi and then forming the estimator Θˆn=13⋅Mn. Your answers below can be functions of θ and n. Follow

  6. Probability

    Natural estimators The random variables Xi are i.i.d. and satisfy E[X2i]=θ. Use a natural estimator to calculate an estimate of θ based on the values X1=1, X2=3, X3=−1, X4=2, X5=0. unanswered In order to calculate confidence intervals around your

  7. Probability

    CI's via the CLT The sample mean estimate Θˆ of the mean of a random variable with variance 1, based on 100 samples, happened to be 22. The 80% confidence interval provided by the CLT is of the form [a,b], with: a= unanswered b= unanswered Your answers

  8. probability; math

    Let X be a continuous random variable. We know that it takes values between 0 and 6 , but we do not know its distribution or its mean and variance, although we know that its variance is at most 4 . We are interested in estimating the mean of X , which we

  9. Math

    Searches related to The random variables X1,X2,…,Xn are continuous, independent, and distributed according to the Erlang PDF fX(x)=λ3x2e−λx2, for x≥0, where λ is an unknown parameter. Find the maximum likelihood estimate of λ , based on observed

  10. Probability

    Estimator properties We estimate the unknown mean θ of a random variable X (where X has a finite and positive variance) by forming the sample mean Mn=(X1+⋯+Xn)/n of n i.i.d. samples Xi and then forming the estimator Θˆ=Mn+1n. Is this estimator

  11. Probability

    Confidence interval interpretation Every day, I try to estimate an unknown parameter using a fresh data set. I look at the data and then I use some formulas to calculate a 70% confidence interval, [Θˆ−,Θˆ+], based on the day's data. Are the following

  12. math, probability

    13. Exercise: Convergence in probability: a) Suppose that Xn is an exponential random variable with parameter lambda = n. Does the sequence {Xn} converge in probability? b) Suppose that Xn is an exponential random variable with parameter lambda = 1/n. Does

  13. Probability

    CLT Let Xn be i.i.d. random variables with mean zero and variance σ2. Let Sn=X1+⋯+Xn. Let Φ stand for the standard normal CDF. According to the central limit theorem, and as n→∞, P(Sn≤2σn−−√) converges to Φ(a), where: a= unanswered

  14. Probability

    Let K be a Poisson random variable with parameter λ : its PMF is pK(k;λ)=λke−λk!,for k=0,1,2,…. What is the ML estimate of λ based on a single observation K=k ? (Your answer should be an algebraic function of k using standard notation.)

  15. Probability

    CLT for the binomial Let X be binomial with parameters n=49 and p=1/10. The mean of X is: unanswered The standard deviation of X is: unanswered The CLT, together with the 1/2-correction, suggests that P(X=6)≈ unanswered You may want to refer to the

  16. Probability

    CLT practice The random variables Xi are i.i.d. with mean 2 and standard deviation equal to 3. Assume that the Xi are nonnegative. Let Sn=X1+⋯+Xn. Use the CLT to find good approximations to the following quantities. You may want to refer to the normal

  17. Probability

    Maximum likelihood estimation The random variables X1,X2,…,Xn are continuous, independent, and distributed according to the Erlang PDF fX(x)= (λ^3*x^2*e^(−λx))/2, for x≥0, where λ is an unknown parameter. Find the maximum likelihood estimate of

  18. Life Orientation

    What role do the media have in reporting human rights violations in a responsible manner?

  19. Probability

    A simple CI Let θ be an unknown parameter, and let X be uniform on the interval [θ−0.5,θ+0.5]. Is [X−2,X+2] an 80% confidence interval? unanswered I form a confidence interval of the form [X−a,X+a]. What is the narrowest confidence interval of

  20. Probability

    We saw that if we want to have a probability of at least 95% that the poll results are within 1 percentage point of the truth, Chebyshev's inequality recommends a sample size of n=50,000 . This is very large compared to what is done in practice. Newspaper

  21. math, probability

    Exercise: CLT applicability Consider the class average in an exam in a few different settings. In all cases, assume that we have a large class consisting of equally well prepared students. Think about the assumptions behind the central limit theorem, and

  22. math

    Ahmed earns $1.50 for every video game he sells. When he sells one carton of 30 video game, he earns an additional $10. What is the minimum number of video games he has to sell in order to earn $450?

  23. Mathematics

    Let Z be a nonnegative random variable that satisfies E[Z4]=4 . Apply the Markov inequality to the random variable Z4 to find the tightest possible (given the available information) upper bound on P(Z≥2) . P(Z≥2)≤

  24. Probability

    By the argument in the last video, if the Xi are i.i.d. with mean μ and variance σ2 , and if Mn=(X1+⋯+Xn)/n , then we have an inequality of the form P(|Mn−μ|≥ϵ)≤aσ2n, for a suitable value of a . a) If ϵ=0.1 , then the value of a is:

  25. Math

    For any given flight, an airline tries to sell as many tickets as possible. Suppose that on average, 20% of ticket holders fail to show up, all independent of one another. Knowing this, an airline will sell more tickets than there are seats available

  26. English

    As a school prefect of your school write a speech on what your school needs

  27. L.O

    Evaluate your own position with regards to the violation of sports personalities' rights by the media?

  28. Chemistry

    Each of the following mixtures is placed in a dialyzing bag and immersed in distilled water. Circle the substances that will be found outside the bag in the distilled water. a. KCl solution and glucose solution b. albumin solution (colloid) c. albumin

  29. physics 2

    A long wire carries a current of 1 ampere.Find the magnitude of the magnetic field 2 meter away from the wire.

  30. Probability

    ML estimation Let K be a Poisson random variable with parameter λ: its PMF is pK(k;λ)=λke−λk!,for k=0,1,2,…. What is the ML estimate of λ based on a single observation K=k? (Your answer should be an algebraic function of k using standard

  31. math

    a plane left atlanta at 11:30am and flew to an airport in boston. the plane was due at boston at 3:15pm. the plane arrived 25 minutes late. The time of the trip was: i just don't get the part time of the trip Please just tell me what i am supposed to do.

  32. math

    Carrie can inspect a case of watches in 5 hours. James can inspect the same case of watches in 3 hours. After working alone for 1 hour, Carries stops for lunch. After taking a 40 minute lunch break, Carrie and James work together to inspect the remaining

  33. math

    one number is 2 more than 3 times another . their sum is 22 . find the number 4,18

  34. Microeconomics - Oligopoly

    Two firms decide to form a cartel and collude in a way that maximizes industry profits. Each firm has zero production costs and each firm is given a positive output quota by the cartel. Which of the following statement(s) are NOT true. (a) Each firm would

  35. LIFE ORIENTATION

    To what extent has the community have or been supporting communities affected by human right violations

  36. Life orientation

    Give a description of a recent (2019 2021) example of how this problem has displayed in your community?

  37. Statistics & Probability

    We start with two independent Bernoulli processes, Xn and Yn, with parameters p and q, respectively. We form a new process Zn by recording an arrival in a given time slot if and only if both of the original processes record an arrival in that same time

  38. Probability

    Tossing a triple of coins We have a red coin, for which P(Heads)=0.4, a green coin, for which P(Heads)=0.5, and a yellow coin, for which P(Heads)=0.6. The flips of the same or of different coins are independent. For each of the following situations,

  39. Probability

    Find the limits Let Sn be the number of successes in n independent Bernoulli trials, where the probability of success at each trial is 1/3. Provide a numerical value, to a precision of 3 decimal places, for each of the following limits. You may want to

  40. Probability

    Convergence in probability. For each of the following sequences, determine whether it converges in probability to a constant. If it does, enter the value of the limit. If it does not, enter the number “999". 1) Let X1, X2,… be independent continuous

  41. physics

    vector A has magnitude 8units and makes an agle of45°with the positive x-axis vector B also has the same magnitude of 8units and directed along the negative x-axis determine the magnitude and direction of A+B?

  42. probability

    Consider a Bernoulli process with parameter p=1/3. Let T1 be the time of the first success and let T1+T2 be the time of the second success. We are told that the results of the two slots that follow the first success are failures, so that XT1+1=XT1+2=0.

  43. computer science

    ____________ is an application program included with Windows that allows the contents of the computer, the hierarchy of folders on the computer, and the files and folders in each folder to be viewed.

  44. Math

    Find the value of an odd natural number x if LCM(x, 40)=1400

  45. Real Estate

    An owner lists her home at a 7% commission rate and wants to net $45,000 after paying the mortgage balance of $68,000 and the broker's commission. To the nearest dollar, what should the selling price be to net her $45,000?

  46. Science

    Determine the final temperature when 100 g of water absorbs 1000 J of thermal energy, given that the initial temperature of the water is 20.0°C. The theoretical specific heat capacity of water is 4.19 J/g·°C. Show your work below.

  47. chemistry

    Each of the following is placed in a dialyzing bag and the bag is then immersed in distilled water. Which substances will be found outside the bag? Check all that apply. NaCl solution albumin solution starch solution

  48. math

    Five boys and seven girls in a history class will go on a field trip during the Easter vacation. They make a committee of three members to prepare for the trip. What is the probability that this committee will consist of three boys? What is the probability

  49. Math for Steve

    1. Identify the part, whole, and percent in the following statement: Find 15% of 750. a. part = 750, whole = n, percent = 15 b. part = 15, whole = 750, percent = p c. part = n, whole = 750, percent = 15 d. none of these 2. Write a percent equation that can

  50. algebra

    A CAN'S DIAMETER IS 3 INCHES, AND IT HEIGHT IS 8 INCHES. WHAT IS THE VOLUME OF THE CAN.

  51. Life orientation

    Give brief description your local newspaper of recent 2019 2021 example of how problems has displayed itself your community town

  52. Life orientation

    Describe two ways in which the law protects citizens against human right violation

  53. Life orientation

    Write personal mission statement that clearly indicates your own position in engaging in service delivery protests that will be a good model to youth

  54. Statistics & Probability

    Consider the same setting as in the last video. After the first busy period ends (with an idle slot), there will be a subsequent busy period, which starts with a busy slot, and lasts as long as the slots are busy. Is it true that the length of the second

  55. Statistics & Probability

    Consider a Bernoulli process, with a “1" considered a success and a “0" considered a failure. Determine whether the process starts fresh right after each of the following random times: 1. The time of the k th failure 2. The first time that a failure

  56. Geometry

    12. To describe a sequence of transformations that maps triangle ABC onto triangle A''B''C'', a student starts with a reflection x-axis. `How should the student complete a sequence of transformations to map ABC onto triangle A''B''C''?

  57. Mathematics

    My piggy bank has only nickels, dimes, and dollar bills. The ratio of nickels to dimes is 2:3, and the ratio of dimes to dollar bills is 8:1. What is the ratio of coins to dollar bills? A 40:3 b 16:3 c 13:1 d 5:1

  58. mathematics

    in a class of 50 student,18 offered mathematics, 21 offered chemistry while 16 offered biology, 7 student offered mathematics and biology, 9 student offered chemistry and biology while 5 student offered the three subject combination. a) find the numbers of

  59. physics

    An inclined plane rises to a height of 2m over a distance of 6m .calculate: A.the Angle of the slope B.the VR(and so IMA) of the inclined plane C.

  60. science

    the basicity of tetraoxosulphate 6 acid is 2 explain the statement with an equation and show the reaction between tetraoxosulphate 6 acid with potassium hydroxide

  61. Life orientation

    Give your own position on this specific problem in our country

  62. Geometry

    If two sides of a triangle are 6 and 16, what is the range of the possible lengths of the third side?

  63. Business

    1. to be a great asset to your company which of the following should you do? a. always look like you're working hard b. be a problem-solver c. be quiet and keep your eyes open d. be friendly with your boss**** 2. When you are required to team up with

  64. probability

    Consider a Poisson arrival process with rate λ per hour. To simplify notation, we let a=P(0,1), b=P(1,1), and c=P(2,1), where P(k,1) is the probability of exactly k arrivals over an hour-long time interval. What is the probability that we will have “at

  65. probability

    For each exam, Ariadne studies with probability 1/2 and does not study with probability 1/2, independently of any other exams. On any exam for which she has not studied, she still has a 0.20 probability of passing, independently of whatever happens on

  66. Math

    In the adult-school classes held several nights per week, 1/2 of the adults enrolled fall into the 41-60 age group, 1/3 of the remainder are over 60, 14 are in the 30-40 age group, and 12 are under 30. How many adults are enrolled in the school? I did 1/2x

  67. Algebra 1- Urgent

    The price of products may increase due to inflation and decrease due to depreciation. Derek is studying the change in the price of two products, A and B, over time. The price f(x), in dollars, of product A after x years is represented by the function

  68. Algebra

    An engineer designs a satellite dish with a parabolic cross section. The dish is 10 ft wide at the​ opening, and the focus is placed 8 ft from the vertex. ​a) Position a coordinate system with the origin at the vertex and the​ x-axis on the​

  69. Algebra

    Farmer Ed has 9,000 meters of​ fencing, and wants to enclose a rectangular plot that borders on a river. If Farmer Ed does not fence the side along the​ river, what is the largest area that can be​ enclosed?

  70. statistics

    A tennis player makes a successful first serve 51% of the time. if she serves 9 times, what is the probability that she gets exactly 3 first serves in? assume that each serve is independent of the others.

  71. Chemistry

    In the recovery of iron from iron ore, the reduction of the ore is actually accomplished by reactions involving carbon monoxide. Use the following thermochemical equations, Fe2O2(s) + 3CO(g) ---> 2Fe(s) +3CO2(g) ΔH° = -28kJ 3Fe2O2(s) + CO(g) --->

  72. algebra

    the ratio of the weight of an object on jupiter to its weight on earth is 8 to 3. how much would a 100 pound person weigh on Jupiter? i`ll tell you the answer when am done solving so you can check if am right

  73. Biology

    In an experiment, a researcher counts the number of oxygen bubbles produced by water plants placed under different colors of light. The researcher finds that water plants placed under white light release more oxygen bubbles than water plants placed under

  74. Traditional african marriage is an advantage for men only,women

    Traditional african marriage is an advantage for men only,not women

  75. Chemistry

    The Ksp of PbBr2 is 6.60× 10^–6. What is the molar solubility of PbBr2 in pure water? What is the molar solubility of PbBr2 in 0.500 M KBr solution? What is the molar solubility of PbBr2 in a 0.500 M Pb(NO3)2 solution?

  76. math

    A fair, six-sided die is rolled eight times, to form an eight-digit number. What is the probability that the resulting number is a multiple of 8? Express your answer as a common fraction.

  77. Chemistry

    Which of the following combinations will make a good buffer solution? 0.05 M H2CO3 + 0.05 M KHCO3 0.5 M HI + 0.5 M CsI 0.3 M NH4Cl 0.3 M NH4Cl + 0.1 M NH3 0.3 M NH4Cl + 0.1 M HCl thanks

  78. Math

    Suppose that the height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. After 11 hours of burning, a candle has a height of 18.6 centimeters. After 27 hours of burning, its height is 12.2 centimeters.

  79. physics

    Two 6.7kg bowling balls, each with a radius of 0.14m , are in contact with one another.What is the gravitational attraction between the bowling balls?

  80. Operations Management

    The maintenance department of a hospital uses 816 cases of liquid cleanser annually. Ordering costs are $12, carrying costs are $4 per case a year, and the new price schedule indicates that orders of less than 50 cases will cost $20 per case, 50 to 79

  81. Calculus:Help!

    Any ideas on how to solve this: Use a vector solution to show that a scalar equation for the line through the points P1(x1, y1) and P2(x2, y2) is y-y1/x-x1 = y2-y1/x2-x1? Very confused as to what is meant by this question. Thanks.

  82. math

    i am confused with this question. what do i need to use in order to solve this question? eliza must fence in a pool area net to a concession stand with 25 m of fencing? what was the dimensions which will maximize the pool area?

  83. Mathematics

    Calculate the area of sector of a circle which subtends an angel of 45°at the center of the circle, radius 14cm. Solve this please.

  84. physics

    1-The position of a particle moving along the x axis is given by x=t^2-〖2t〗^3-6, where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction?

  85. Mathematics

    Salma will rent a car for the weekend. She can choose one of two plans. The first plan has an initial fee of $47.98 and costs an additional $0.16 per mile driven. The second plan has an initial fee of $51.98 and costs an additional $0.12 per mile driven.

  86. life orientation

    Give a description of a recent (2018-2021) example of how this problem has display itself in your community

  87. Life orientation

    Give a brief description from your local newspaper of recent (2019-2021) example of how gender based violence has displayed itself in community town?

  88. Mathematics history Geography Life science

    Explain how the organization addresses or would address the violation and if it is a worthy cause

  89. Life orientation

    Example of how this problem has displayed itself in your community

  90. Life orientation

    Write your personal mission statement that clearly indicates your own position in engaging in service delivery protests that will be a good model to the youth.

  91. Life Orantaition

    State your position on this specific problem in South Africa

  92. algebra

    Which equation represents the axis of symmetry of the function y = x² − 4x − 6

  93. Biochemistry

    a) Explain stationary phase and mobile phase in thin-layer chromatography. b) In thin layer chromatography, the stationary phase is made of _________ and the mobile phase is made of _________. Write the correct answer.

  94. Statistics & Probability

    Consider a Poisson process with rate λ=1. Consider three times that satisfy 0

  95. Statistics & Probability

    Let Yk be the time of the k th arrival in a Poisson process with parameter λ=1 . In particular, E[Yk] = k . 1. Is it true that P(Yk≥k) = 1/2 for any finite k ? 2. Is it true that limk→∞P(Yk≥k) = 1/2 ?

  96. Statistics & Probability

    Consider a Poisson process with rate λ=4, and let N(t) be the number of arrivals during the time interval [0,t]. Suppose that you have recorded this process in a movie and that you play this movie at twice the speed. The process that you will be seeing in

  97. Calculus

    An object is shot up into the sky according to s(t)= -16t^2+64t where s(t) = height above the ground in feet at t seconds. Find the a. velocity at 2 seconds b. acceleration at 1 second c. maximum height of the object.

  98. Math

    Find the average rate of change of the function f(x)=x^2+4x from x1=1 to x2=-7

  99. Chemistry

    A is a solution of trioxonitrate(v)acid (nitric acid) HNO3 of unknown concentration.B is a standard solution of sodium hydroxide containing 4.00g per dm3 of solution a). Suggest with a reason,a suitable indicator for the reaction b) Write a balanced

  100. mathematics

    Mandy earned x dollars and Andy earned 4x �+ 7 dollars on the first day of a charity carwash. If Mandy and Andy each earned the same amounts on the second and third days of the car wash, how much did they earn together over the course of the 3 days?