lijm
Popular questions and responses by lijm
math, probability
In the game of blackjack, a 2card 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 
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 
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 
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 straightline 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 
math
During the first year at a university that uses a fourpoint grading system, a freshman took ten threecredit 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 
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 
math
Maxwell purchased $15,000 worth of 52week TBills 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 
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 
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 
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 
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 
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 
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 
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 slopeintercept if possible? 23/51= 1/4
asked on November 25, 2019 
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 
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 12 34 5 or more Respondents 650 200 150 b) What is the probability that a participant
asked on October 10, 2019 
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 
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 
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 
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 
math
Only need my answer to be check. Problem: 2x3y=6 3x+6y=16 I rewrote both as 1) y=2/3x2 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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 AD. I
asked on November 21, 2019 
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 
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 
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 
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 
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 
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 
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 
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 
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 
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 
math
Find C(n,x) p^xq^nx 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: 11/3=2/3 nx=42=2 P(X=0) = C(4,0) (1/3)^0 (2/3)^2
asked on November 7, 2019 
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 
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 
math, probability distribution
The birthrates in the U.S for the years 20032012 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 
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 
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) (12)^2+ (.3) (22)^2 + (.2) (32)^2 + (.1) (42)^2 but I don't know if I used the formula correctly
asked on November 4, 2019 
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 
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 
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 
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 
math, probability
How would you find p(AlBcomplement)? Just 1 the probability of b?
asked on October 28, 2019 
math, probability
Two cards are drawn without replacement from a wellshuffled 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 
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 
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) 1.20.18=1.02 *0.18 because I solved for P(A∩B) in the previous question.
asked on October 22, 2019 
math
What makes two events complementary? What does complementary even mean?
asked on October 9, 2019 
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 
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 
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 
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 
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 
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 
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 
math, element sets
Is the element the number of numbers in a set?
asked on September 24, 2019 
math
What does exponent little c stand for?
asked on September 23, 2019 
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 
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 
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 
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)^121 = 9.38%
asked on September 18, 2019 
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 
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 
math
For the substitution method, is there a right equation to pick from the set and rewrite it? My problem is 3x2y=1 2x+4y=1 I chose 2x+4y=2 and came up with x=12y which I will later plug into 3x2y=1. Or do I have to choose 3x2y=1? My tactic is picking the
asked on September 9, 2019 
math
For 2x5y=16, 6x15y=30 I think there are zero number of solutions.
asked on September 7, 2019 
Math
1) x+2y=7, 2xy=4 What I did: multiply 2xy=4 by 2 so I could eliminate the y variable. 4x2y = 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 
math
Find the point of intersection: y=3x+y y=2x+9 My work: 3x+4= 2x+9 3x+44=2x+94
asked on September 4, 2019 
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 
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

math
Or 1 p(t)*p(p)?
posted on November 30, 2019 
Math
x+y=500 > y=500x 42x+30(500x)=18,600 42x+1500030x=18,600 12x+1500015000=1860015000 12x=3600 x=300 300+y=500 300300+y=500300 y=200
posted on November 30, 2019 
Math
x/corn= 300 and y/soybeans=200
posted on November 30, 2019 
math
I think I used the wrong formula for 3.
posted on November 25, 2019 
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 
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 
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 
math, probability
I must find P(B) right? I designated B for cheese and A for meat.
posted on November 14, 2019 
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 
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 
math
Nevermind I actually plugged in the wrong number for x. Please ignore.
posted on November 7, 2019 
math
If it doesn't meet every single rule, then it is not a binomial?
posted on November 7, 2019 
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 
math, probability distribution
a) then just the birthrates? b) 13.7/1000, 13.8/1000 instead?
posted on November 6, 2019 
math, variance
And then the standard deviation is the square root of the variance?
posted on November 4, 2019 
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