10/02/21

Which probability distribution favors the most recent data?
I know that Gaussian (Normal) distribution has two parameters (mean and variance) which are updated with every new data point. But in the Normal distribution, the old data have a similar effect on... more
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10/02/21

Find a cubic polynomial such that P(-3) =0, P(2)=-4 and P(x)>0 only when x>5
PLEASE HELP DUE TODAY This question has been stumping me for the longest time
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10/02/21

How do I find the probability for when it says "at least 2"

assume that when human resource managers are randomly selected, 57% say job applicants should follow up within two weeks. If 6 human resource managers are randomly selected, find the probability... more
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10/01/21

Calculus problem

find a function such that f'(s)=5x^3 and the line x+y=0 is tangent to the graph of f
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09/30/21

Calculus Vectors
The position of a particle in the​ xy-plane at time t is r(t)=(t+4) i+(t^2−2)j. Find an equation in x and y whose graph is the path of the particle. Then find the​ particle's velocity and... more
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09/30/21

Solve the following systems of equations. Show all work.
1). 4x² + 8x + 5 - y = 1   3x² - x + 3 = y + x + 82). 4x2 – 2y2 = 4   x2  + y2 = 10
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09/30/21

A company is preparing to launch a new web site to sell its products. They know that purchases at the site will occur as a Poisson process with on average 22 purchases every 10 minutes.
What is the expected time in minutes until the sixth purchase? Give your answer to four decimal places.  (ANS: 2.7273)What is the probability that the sixth purchase will occur between 2.27 minutes... more
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09/30/21

Number of Positive Factors Question
Hello, I was trying to figure out if the number 4294967297 was prime or composite. I figured out the answer is composite and that it is divisible by 641, but it took me longer to figure out than I... more
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09/29/21

36 x − 2x^2 − 169 < h( x ) < x^2 − 18 x + 74

36 x − 2x^2 − 169 < h( x ) < x^2 − 18 x + 74 We want to use the Squeeze Theorem to evaluate limx→9 h(x)  First evaluate:  limx→9 36x−2x^2−169 Next evaluate:  limx→9. x^2−18x+... more
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09/28/21

One-to-one question
Explain why the following statement must be True, or provide a counterexample to show that it can be False.If  𝑓 and  𝑔 are one-to-one functions defined on all of  ℝ, then the... more
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09/22/21

Tan 15 degrees ÷ 2- 2tan squared 15 degrees

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09/18/21

Conic Section Circle
The circle is passing through the two points (- 3, 0) and (7,4) and is centered at a point on the y-axis
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09/15/21

Quadratic equation help
Jim is landscaping his backyard which is 16‘ x 25‘. He will buy 162 ft.² of sod to put in the middle leaving a uniform with around the four edges for planting flowers. What dimensions will the sod... more
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09/14/21

 Assume that there are 6 different issues of Newsweek magazine, 7 different issues of Popular Science, and 3 different issues of Sports Illustrated, including the December 1st issue, on a rack.
 Assume that there are 6 different issues of Newsweek magazine, 7 different issues of Popular Science, and 3 different issues of Sports Illustrated, including the December 1st issue, on a rack. You... more
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09/14/21

Assume that there are 6 different issues of Newsweek magazine, 7 different issues of Sports Illustrated, and 4 different issues of Time, including the December 1st issue, on a rack.

Assume that there are 6 different issues of Newsweek magazine, 7 different issues of Sports Illustrated, and 4 different issues of Time, including the December 1st issue, on a rack. You choose 4 of... more
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09/14/21

involving the assignment of tasks to student union board members. Assume that there are 12 board members: 7 females, and 5 males including Larry. There are 3 tasks to be assigned.

involving the assignment of tasks to student union board members. Assume that there are 12 board members: 7 females, and 5 males including Larry. There are 3 tasks to be assigned. Note that... more
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09/14/21

Assume that 5 people, including the husband and wife pair, apply for 2 sales positions. People are hired at random.
Assume that 5 people, including the husband and wife pair, apply for 2 sales positions. People are hired at random.(1) What is the probability that both the husband and wife are hired?  (2) What is... more
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09/14/21

You select 7 cards randomly from a deck of 52 cards.
You select 7 cards randomly from a deck of 52 cards.What is the probability that all of the cards selected are face cards (i.e. jacks, queens, or kings)? 
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09/14/21

A bag contain 10 white and 6 black balls, 4 balls are successively drawn out and not replaced. What are the probability of they are of alternately different colours
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09/09/21

probability statistics

A casino runs a game which consists of a sequence of coin tosses, if toss head, then gain +1 and the probability is 1/2. If toss the tail, then gain -1 and the probability is 1/2. A gambler starts... more
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09/09/21

Probability question
Two players, A and B, alternately and independently flip a coin and the first player to obtain a head wins. Assume player A flips first(a) if the coin is fair, what is the probability that A... more
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09/09/21

Probability question
Two people each toss a fair coin n times, Find the probability that they will toss the same number of heads
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09/07/21

mathematics for economists

Find the extreme values of f(x,y) = 6y2+x2 subject to the constraint x2+y2= 4.
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09/04/21

How much does the empty jar weigh?
A jar filled to 1/4 with jam weighs 250g. When the jar is 3/4 full, it weighs 350g. How much does the empty jar weigh?
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08/30/21

Stein–Chen identity for the Poisson
1-) Solve the following:a-) If X ∼ Pois(λ) and g is any function, show that :E [Xg(X)] = λ E [g(X + 1)] (This is called the Stein–Chen identity for the Poisson.) b-) Find the third moment E [X3 ]... more
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