lijm

Popular questions and responses by lijm
  1. math, probability

    In the game of blackjack, a 2-card hand consisting of an ace and either a face card or a 10 is called a "blackjack". If a standard 52 card deck is used, determine how many blackjack hands can be dealt. (A "facecard" is a jack,queen,or king). I am not that

    asked on October 3, 2019
  2. math

    In a survey of 120 consumers conducted in a shopping mall, 80 consumers indicated that they buy Brand A of a certain product, 68 buy Brand B, and 42 buy both brands. How many consumers participating the survey buy: a) At least one of these brands? b)

    asked on September 26, 2019
  3. math, breakeven point

    AutoTime, a manufacturer of electronic digital timers, has a monthly fixed cost of $48,000 and a production cost of $8 for each timer manufactured. The timers sell for $14 each. My cost function is 8x+48,000 My revenue function is 14x My profit function is

    asked on September 3, 2019
  4. math, depreciation

    A workcenter system purchased at a cost of $60,000 in 2015 has a scrap value of $12,000 at the end of 4 years. If the straight-line method of depreciation is used. a) find the rate of depreciation. b) Find the linear equation expressing the system's book

    asked on September 3, 2019
  5. math

    During the first year at a university that uses a four-point grading system, a freshman took ten three-credit courses and received two As, three Bs, four Cs, and one D. a) Compute this student's g.p.a. What I did : 2+3+4+1/4=2.5 2.5 g.p.a b) Let the random

    asked on November 1, 2019
  6. math, financial math

    What formula would you use when there is inflation and you must find the price of a product in the past several years? But you are given, the present value, the interest rate (r), and t.

    asked on September 17, 2019
  7. math

    Maxwell purchased $15,000 worth of 52-week T-Bills for $14,650. What will the rate of return be on his investment? Did I set the equation right? A= 15,000 P=14,650 t=52 weeks r=? 15,000=14650(1+r*52)

    asked on September 14, 2019
  8. math

    A ball and a bat cost $110 total. The bat costs $100 more than the ball. How much does the ball cost? For this system of equation, I designated x for the ball and y for the bat. I know that both equal to 110. So I wrote the first equation as x+y=110 I

    asked on September 8, 2019
  9. Math

    As cell phones proliferate, the number of pay phones continues to drop. The number of pay phones from 2004 through 2009 (in millions) are shown below (x=0 corresponds to 2004) : year,x : 0, 1, 2, 3, 4, 5 Number of pay phones: 1.30, 1.15, 1, 0.84, 0.69,

    asked on September 3, 2019
  10. math

    Food prices have been rising at a rate of 4% per year for several years. If the annual cost of food for a typical family of four is $10,500 today, what would it have been 15 years ago? Do I use the A=P(A+rt) formula? It doesn't seem like the compound

    asked on December 5, 2019
  11. math

    The number of chocolate chips per cookie in Charlie's Chocolate Chip Cookie Shop is given by the following probability distributions, where X is the number of chocolate chips per cookie: x 8 9 10 11 12 P(X=x) .1 .2 .4 .2 .1 a)Find the probability that a

    asked on December 2, 2019
  12. math

    Bill entered three contests. The probability he will win contest A is .2, the probability that he will win Contest B is .1 and the probability that he will win the Contest C is .6. Assuming that these events are all independent of one another, what is the

    asked on December 1, 2019
  13. math

    For these two review questions, I want to make sure I'm understanding the concept behind these. 1) A dessert stand sells candy bars for $2.00 and ice cream sandwiches for $3.00. If 100 of these were sold for $250, how many candy bars and ice cream

    asked on November 25, 2019
  14. math

    I am reviewing for my final exam on December 11. I'm working on a practice sheet and I want to know if my answers are correct. 1) Find the equation of the line passing through the points (1,3) and (5,2). Put into slope-intercept if possible? 2-3/5-1= -1/4

    asked on November 25, 2019
  15. math

    I know I posted this yesterday but I wanted to check if my answer to part b is correct. In a lottery, 5000 tickets are sold for $1 each.... one 1st prize of $2000, 1 2nd prize of $500, 3 third prizes of $100, and 10 consolation prizes of $25 are to be

    asked on November 2, 2019
  16. math, probability

    In a survey of 1000 social media account holders, the following question was asked: how many social media accounts do you have? The results are summarized below: Answer 1-2 3-4 5 or more Respondents 650 200 150 b) What is the probability that a participant

    asked on October 10, 2019
  17. math

    An experiment consists of recording in order of their births, the sex composition of a four child family in which the children were born at different times. Describe an appropriate sample space s for this experiments I can do GGGB,

    asked on October 9, 2019
  18. math

    Twelve graduate students have applied for three available teaching assistantships. In how many ways can the assistantships be awarded if: a) No preference is given to any student? b) One particular student must be awarded an assistantship? c) The group of

    asked on October 8, 2019
  19. math

    For this exercise, let A and B be subsets of a universal set U and suppose n(U)= 200, n(A)= 100, n(B)= 80, and n (A∩B)=40. Compute: n (A U B) For this exercise would I compute it by using the addition rule? n(A U B) = n(A) +n(B) - n (A ∩ B) n(A U B) =

    asked on September 26, 2019
  20. math,financial math

    A bank deposit paying simple interest grew from an initial amount of $1000 to $1075 in 9 months, Find the interest rate. I know the formula is I=Prt. I also know I am looking for r, the interest rate. So here is how I set up my equation. 1075=1000(3/4r)

    asked on September 12, 2019
  21. math

    Only need my answer to be check. Problem: 2x-3y=6 3x+6y=16 I rewrote both as 1) y=2/3x-2 2)1/2x+8/3 set them both equal to each other and got -4 for x. I plugged it in for one of the original equations and got 2/3 as y for the point (-4,2/3).

    asked on September 4, 2019
  22. math

    The demand equation for the BWS Bluetooth wireless loudspeaker is p=-0.05x+200 where x is the quantity demanded per month and p is the unit price in dollars. Sketch the graph of the demand curve. How can I start? What points could I plot? So I am thinking

    asked on September 1, 2019
  23. math, linear functions

    In a report issued by the U.S Department of Transportation in 2020, it was predicted that the number of passengers boarding planes in the United States would grow steadily from the current 0.7 billion boardings/year to 1.2 billion boardings/year in 2032.

    asked on December 7, 2019
  24. math, linear functions

    The California emissions cap is set at 400 million metric tons of carbon dioxide equivalent in 2015 and is expected to drop by 13.2 million metric tons of carbon dioxide equivalent per year through 2020. a. Find a linear function f giving the California

    asked on December 7, 2019
  25. math

    How many days will it take for a sum of $2000 to earn $40 interest if it is deposited in a bank paying simple interest at the rate of 3.6% per year? What I did: I=Prt 40=2000(3.6t) 40=7200t 40/7200=7200t/7200 t= .0055555556

    asked on December 5, 2019
  26. math, normal distributions

    A coin is weighted so that the probability of obtaining a head in a single toss is .4. If the coin is tossed 25 times, what is the probability of obtaining: a) Fewer than 10 heads? b) Between 10 and 12 heads, inclusive? c) More than 15 heads? This is what

    asked on December 3, 2019
  27. math, Linear Equations

    Which variable is for the equation of the horizontal line and which variable is for the equation of the vertical line?

    asked on December 2, 2019
  28. math

    Emilie is playing a game. The probabilities that she will win $5, win $10 or lose $3 are 0.2, 0.1, and 0.7, respectively. What are Emilie's expected winnings losses? What I did: Wins: 5 (0.2) + 10 (0.1) = 2 Loss: 3 (0.7) = 2.1

    asked on December 1, 2019
  29. math

    The probability that Santa Claus is coming to town is 0.8. The probability that the Grinch is coming to town is 0.15. Find the probability that both Santa Claus and the Grinch come to town if the two events are mutually exclusive. Is this just Ø since

    asked on December 1, 2019
  30. math

    Cindy's Ciders produces and sells spiced apple cider. Cindy has a monthly fixed cost of $3080 and production costs of $3 per gallon of cider. Each gallon of cider sells for $8.50. a) Find the monthly cost function associated with Cindy's Cider (let x=

    asked on December 1, 2019
  31. math, binomials

    Patty's pastries has 400 employees. It has been estimated that the probability of a worker gaining 6 pounds per year is .2. Use the normal approximation to the binomial random variable to find the probability that at least 90 of her workers will gain 6

    asked on December 1, 2019
  32. math

    Thomas planted tomatoes, peppers, and green beans. The probability that the tomato plant will produce tomatoes is .8, the probability that the pepper plant will produce peppers is .4 and the probability that the green bean plant will produce green beans is

    asked on November 30, 2019
  33. Math

    How many different 7 digit numbers can be formed from the numbers "2,3,4,5,6,7,8" ? Is this a permutation?

    asked on November 30, 2019
  34. math

    Jonathan wants to have $14,300 in 6 years. How much money should he deposit into an account paying 6.2% yearly interest, compounded weekly, to meet this goal? So I must use A=P (1+r/m)^mt? Since his future value/A is 14,300, I must find p? A= 14,300 t=6

    asked on November 30, 2019
  35. math

    Patty takes out a 105 day loan for $12,000. The yearly interest rate for the loan is 13.5% simple interest. How much money will she owe at the end of the 105 days? I think that the formula is A=P(1+rt) correct? And since it is asking for how much she will

    asked on November 30, 2019
  36. Math

    Old McDonald has 500 acres of land to plant in corn and soybeans. The cost of cultivating corn is $42 per acre and the cost of cultivating soybeans is $30 per acre. Old McDonald has $18,600 available for cultivating these crops. If Old McDonald wishes to

    asked on November 30, 2019
  37. math

    1) The chances you go to the game on Saturday is 0.3, and the probability of staying home on Sunday is 0.4. Find the probability of doing both: a. If they are mutually exclusive b. if they are independent For this problem, p(a) = game and p(b) = staying.

    asked on November 26, 2019
  38. math, normal distributions

    The scores on a sociology examination are normally distributed with a mean of 70 and a standard deviation of 10. If the instructor assigns As to 15%, Bs to 25%, Cs to 40%, Ds to 15%, and Fs to 5% of the class, find the cutoff points for grades A-D. I

    asked on November 21, 2019
  39. math, binomials

    1) If the probability that a tennis player will serve an ace is .27, what is the probability that he will serve: (only set up. DO NOT evaluate.) a) exactly 3 aces out of 8 serves? b) at least 1 ace out of 8 serves? a) p(x=3) (8,3) (.27)^3 (.73)^5 b) At

    asked on November 19, 2019
  40. Math, binomials

    A binomial experiment consists of 9 independent trials. The probability of success in each is 0.4. a) Using the tables findP(X(less than or equal to symbol) 3). b) Find the mean and standard deviation of the random variable associated with this experiment.

    asked on November 18, 2019
  41. math, probability

    Molly's mugs has the following in stock: (below here is a table) Small medium large total Plastic 12 8 5 25 Metal 6 14 10 30 Ceramic 20 28 25 73 Total 38 50 40 128 Find the probabilities if one mug is randomly selected. a) The probability that the mug is

    asked on November 18, 2019
  42. math, probability

    I completed a review sheet and I need someone to check my answers. I will post the link here so I am not pestering everyone by posting a lot. imgur. com/a/A Uh4O qM Without the spaces

    asked on November 15, 2019
  43. math, probability

    I am studying for an exam on Wednesday that covers probability. But I wanted to check in here for a refresher since it's been 2 or 3 weeks since I've worked on questions like this. 85% of the pizzas offered in Mario's Pizza Palace have both meat AND cheese

    asked on November 14, 2019
  44. math, probability

    In a study conducted by the Bank of America, it was found that 34% of young Millenials say that they sleep with their smartphone on their bed. If four Millenials are selected at random what is the probability that: a) None of them sleep with their phone on

    asked on November 10, 2019
  45. math

    I only need my answer to be checked. In a lottery, 5,000 tickets are sold for $1. One first place prize of $1,000, 1 second prize of $500, 4 third prizes of $100 and 10 consolation prizes of $10. What is the expected net earnings of a person who buys a

    asked on November 10, 2019
  46. math, probability

    A fair die is rolled 4 times a) create a probability distribution for the number of times the die rolls a 3. Do I solve this using the bernoulli trials formula? Or should I just examine the frequencies like this? E= Rolling a 3 A= Not a 3 EAAA 1 3 EEAA 2

    asked on November 9, 2019
  47. math

    Given the probability that a certain tennis player will serve an ace is 1/4 and serves 5 times. a) write a probability distribution of the number of times the player serves an ace. b) what is the probability of serving less than 3 aces? c) what is the

    asked on November 8, 2019
  48. Math

    The following table gives the total caseload in the New York State courts form 2004 through 2009. Year 2004 2005 2006 2007 2008 2009 Cases (in MM) 4.2 4.3 4.6 4.5 4.7 4.7 A) Find the mean and standard deviation of the data. B) Consider the second table for

    asked on November 8, 2019
  49. math

    Find C(n,x) p^xq^n-x for the given values of n,x, and p. n=4, x=2, p=1/3 Did I set this up right? To find q: 1-1/3=2/3 n-x=4-2=2 P(X=0) = C(4,0) (1/3)^0 (2/3)^2

    asked on November 7, 2019
  50. math

    Justify if the following is a binomial. Rolling a fair die 3 times and observing the number that appears uppermost. There are 3 trials. So that is fixed. But there doesn't seem to be the two outcomes of success and failure. It isn't really clear in this

    asked on November 7, 2019
  51. math

    Justify whether or not the following is a binomial. Rolling a fair die 3 times and observing the number of times a 6 is thrown. I know that the binomial rules are : 1. The number of trials in the experiment is fixed. 2. There are two outcomes of each

    asked on November 7, 2019
  52. math, probability distribution

    The birthrates in the U.S for the years 2003-2012 are given in the following table. (The birthrate is the number of live births/1000 population.) Year 2003 2004 2005 2006 2007 Birthrate 14.7 14.0 14.0 14.2 14.2 Year 2008 2009 2010 2011 2012 Birthrate 14.0

    asked on November 5, 2019
  53. math, variance

    When looking at histograms, how can you tell based on the bars if there is a small variance or a large variance?

    asked on November 4, 2019
  54. math, variance

    Based on the table, find the variance. X 1 2 3 4 P(x=x) .4 .3 .2 .1 I previously computed the mu and got 2 as an answer. what I did: (.4) (1-2)^2+ (.3) (2-2)^2 + (.2) (3-2)^2 + (.1) (4-2)^2 but I don't know if I used the formula correctly

    asked on November 4, 2019
  55. math

    The island club... ten thousand tickets sold for $2 each... first prize of $3000, 3 second prizes of $1000 each, 5 third prizes of $500 each, and 20 consolation of $100 each. Find the expected value. Is it found through (1/10k) * (3000) + (3/10k) * (1000)

    asked on November 2, 2019
  56. math

    In a lottery, 5000 tickets are sold for $1 each.... one1st prize of $2000, 1 2nd prize of $500, 3 third prizes of $100, and 10 consolation prizes of $25 are to be awarded. I want to set up a probability distribution table to help me solve this problem but

    asked on November 1, 2019
  57. math

    I only need someone to check my answers. Find the expected value of a random variable X having the following probability distribution: x -15 -1 0 1 5 8 p (x=x) .12 .16 .28 .22 .12 .10 E(X) = (-5) * (.12) + (-1) *(.16) + (0) * (.28) + (1) * (.22) + (5)

    asked on November 1, 2019
  58. math,probability

    I only need someone to check my answers for two questions. 1) In a survey of 1000 people about emergency living expense savings .... the following results were retained (basically the number of months the person could live on savings): Group 1 2 3 4 Time

    asked on October 30, 2019
  59. math, probability

    How would you find p(AlBcomplement)? Just 1- the probability of b?

    asked on October 28, 2019
  60. math, probability

    Two cards are drawn without replacement from a well-shuffled deck of 52 playing cards. a. What is the probability that the first card drawn is a heart? b. What is the probability that the second card drawn is a heart if the first card drawn was not a

    asked on October 24, 2019
  61. math

    A pair of fair dice is rolled. Let E denote the event that the number landing uppermost on the first die is a 3, and let F denote the event that the sum of the numbers landing uppermost is 7. Determine whether E and F are independent events. For E and F to

    asked on October 23, 2019
  62. math

    I'm not sure if I'm doing this right. Determine whether events A and B are independent. P(A) =.5, P(B)= .7, P(AUB)= .85 P(AUB) = P(A) + P(B) - P(A∩B) .5 +.7 - P(A∩B) 1.2-0.18=1.02 *0.18 because I solved for P(A∩B) in the previous question.

    asked on October 22, 2019
  63. math

    What makes two events complementary? What does complementary even mean?

    asked on October 9, 2019
  64. math

    Question says " Are events E & F mutually exlusive". I am given E = {a,b} and F = {a,d,f}. I think they are not. I think that if they were mutually exclusive, they would not have any elements in common right? Because I see that E and F have a in common.

    asked on October 9, 2019
  65. math

    The U.S Olympic gymnastics team for the 2016 Rio Games comprised five women and five men. In how many ways can this group of athletes arrange themselves in a row for a group picture if: a) There is no restriction b) The men stand together in a group and

    asked on October 8, 2019
  66. math

    1) At a college library exhibition of faculty publications, 3 math books, 4 social science books, and 3 bio books will be displayed on a shelf (assume that all books are different.) In how many ways can the ten books be arranged on the shelf if books on

    asked on October 8, 2019
  67. math

    When is it appropriate to use the combination formula in a word problem? When is it appropriate to use the permutation formula in a word problem?

    asked on October 6, 2019
  68. math,factorials

    6!/2!3! For this problem, I did 6*5*4*3*2*1/2*1*3*1 for the answer 729/6=120

    asked on October 6, 2019
  69. math

    The panini cafe has a special lunch menu in which the diner chooses a soup or salad, a main course, and a dessert. There are 3 choices of soups, 3 for salads, 5 for the main, and 4 for desserts. How many different 3 course meals can diners order for lunch?

    asked on October 3, 2019
  70. math, probabilty sets

    If both set x and set y have no numbers in common does x∩y become a blank set written as { }?

    asked on September 25, 2019
  71. math, element sets

    Is the element the number of numbers in a set?

    asked on September 24, 2019
  72. math

    What does exponent little c stand for?

    asked on September 23, 2019
  73. math

    The set of gold medalists in the 2014 Winter Olympic games in set builder notation. I don't get what I'm supposed to do.

    asked on September 23, 2019
  74. Math

    I know I put this question yesterday but I tried it again with a new understanding. Val sold 2 types of Valentine's day bouquets: deluxe and special. For deluxe, there were 6 roses and 9 carnations. For the special bouquet, there were 3 roses and 9

    asked on September 18, 2019
  75. math, financial math

    A basket of May flowers at Betty's Blooms cost $35 today. Assuming that inflation has been running at 5.1% per year for the past several years, how much did a comparable basket of flowers cost 7 years ago? When dealing with a value of the past (7 years

    asked on September 18, 2019
  76. Math, effective rate

    I only need my problem to be checked. What is the effective annual rate of an account offering .09% monthly interest compounded monthly? Since it is compounded monthly, my m is equal to 12. My rate is 0.09. reff= (1+0.09/12)^12-1 = 9.38%

    asked on September 18, 2019
  77. math, financial math

    Simple interest grew from the initial amount $1000 to $1075 in 9 months. Find the interest rate. Like always, I will explain my thinking: I know I have the find r (the interest rate). A=1075 P=1000 t=3/4 (9/12 becomes 3/4) The formula is A= P(1+rt) which

    asked on September 12, 2019
  78. math, financial math

    Question says " Find the accumulated amount at the end of 9 months on an $800 deposit in a bank pating simple interest at a rate of 6% year". I know that the simple interest formula is A=P (1+rt) With p being $800 and r being 0.06. I know that t is the

    asked on September 12, 2019
  79. math

    For the substitution method, is there a right equation to pick from the set and rewrite it? My problem is 3x-2y=1 2x+4y=1 I chose 2x+4y=2 and came up with x=1-2y which I will later plug into 3x-2y=1. Or do I have to choose 3x-2y=1? My tactic is picking the

    asked on September 9, 2019
  80. math

    For 2x-5y=16, 6x-15y=30 I think there are zero number of solutions.

    asked on September 7, 2019
  81. Math

    1) x+2y=7, 2x-y=4 What I did: multiply 2x-y=4 by -2 so I could eliminate the y variable. -4x-2y = -8 + x +2y =7 = -3x =-1 Divided -1 by =1 and got x=1/3 I only need someone to check my answer. Also one last question, can I use the elimination method for

    asked on September 7, 2019
  82. math

    Find the point of intersection: y=3x+y y=-2x+9 My work: 3x+4= -2x+9 3x+4-4=-2x+9-4

    asked on September 4, 2019
  83. math, supply equation

    The supply equation for the Wilkinson washable computer keyboard is p=0.03x+80. Where x is the quantity supplied per month and p is the unit price in dollars. a) find the points that would be used to sketch a graph of the supply curve b) what is the lowest

    asked on September 3, 2019
  84. Math

    The quantity demanded for a certain brand of MP3 players is 200 units when the price is set at $90. The quantity demanded is 1,200 units when the unit is $40. Find the demand equation. For this problem, I set the points as (demand quantity, price). So my

    asked on September 3, 2019
  1. math

    Or 1- p(t)*p(p)?

    posted on November 30, 2019
  2. Math

    x+y=500 ---> y=500-x 42x+30(500-x)=18,600 42x+15000-30x=18,600 12x+15000-15000=18600-15000 12x=3600 x=300 300+y=500 300-300+y=500-300 y=200

    posted on November 30, 2019
  3. Math

    x/corn= 300 and y/soybeans=200

    posted on November 30, 2019
  4. math

    I think I used the wrong formula for 3.

    posted on November 25, 2019
  5. math

    But are 3 and 4 set up right? That's all I'll ask and I'll shut up.

    posted on November 25, 2019
  6. math

    Thats what the calculator gave me and the question was actually written like that. It was on a review sheet.

    posted on November 25, 2019
  7. math, probability

    I was wondering because my professor gave us these answers: a) 30/128 b) 6/128 c) 70/128 d) 78/128 e) 25/40 f)12/25

    posted on November 18, 2019
  8. math, probability

    I must find P(B) right? I designated B for cheese and A for meat.

    posted on November 14, 2019
  9. Math

    For part c, it looks like the mean is larger for NY so I think NY has more court cases than Pennsylvania.

    posted on November 8, 2019
  10. Math

    For the second table: Frequencies: 3.4 appears once, 3.5 appears once, 3.2 appears once, 3.7 appears once, 3.9 appears once, 3.8 appears once. 6 total items. X 3.4 3.5 3.2 3.7 3.9 3.8 p(x=x) 1/6 1/6 1/6 1/6 1/6 (3.4) * (1/6) + (3.5) * (1/6)+(3.2) * (1/6) +

    posted on November 8, 2019
  11. math

    Nevermind I actually plugged in the wrong number for x. Please ignore.

    posted on November 7, 2019
  12. math

    If it doesn't meet every single rule, then it is not a binomial?

    posted on November 7, 2019
  13. math

    For 4, if they're independent, it would look something like this right? E= { SFF, SFS, SSF, FFS, FSS, FSF, FFF} 1 s 2s 2s 1s 2s 1s 0s With s standing for success and the numbers being the number of successes.

    posted on November 7, 2019
  14. math, probability distribution

    a) then just the birthrates? b) 13.7/1000, 13.8/1000 instead?

    posted on November 6, 2019
  15. math, variance

    And then the standard deviation is the square root of the variance?

    posted on November 4, 2019
  16. math

    I attempted to find the E(X) and got .61 (1/5000)*(2000)+(1/5000)*(500)+(3/5000)*(100)+(10/5000)*(25).

    posted on November 1, 2019