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comment Calculus I/II/III
Don't we have a page that lists help sources such as openstudy.com, and jillions of other sites (both commercial and free)? @musicalmanifesto Contact me via the info in my profile and I might be able to help.
15h
comment What is the probability that a psychic correctly “predicts” the outcome of at least 5 out of 10 coin flips?
Yes, but remember that you can get any 5 correct, any 6 correct, etc, so you need to multiply by 10 choose 5 for 1/32, 10 choose 6 for 1/64, and so on. Another way to see why your solution is wrong: what are the chances the psychic will be wrong on 5 or more flips? Computing it your way would give 63/1024, which means the total probability is 126/1024, which is less than 1.
2d
comment let $\alpha \in \Bbb{R} $ and $\cos(\alpha \pi) = \frac{1}{3}$, prove $\alpha $ is irrational
That's how I would proceed as well. What's your next step? You might consider using Euler's formula.
2d
comment How do I compute the angles of a pyramid from the angle between its sides?
Your attempts are worth mentioning, if only because it will encourage more people to help you.
2d
comment A closed form for the following Series
isc.carma.newcastle.edu.au/advancedCalc also finds nothing.
Feb
5
comment Probability to get from A to C.
Your analysis is correct, but the statement "Note that whether the 2 roads are passable/ not passable are independent" seems a little unrealistic.
Feb
5
comment Lotto Probabilities
Well, 5 tickets with 6 numbers each is 30 numbers total out of 59 possible numbers, so, not a trivial chance of at least one number matching across the tickets.
Feb
5
comment Probability of drawing $m$ of $A$ in $n$ cards given a deck of $d$ cards contain $a$ copies of $A$?
So you want to draw m cards out of a total and n-m cards out of the remaining d-a cards?
Feb
5
comment Maximum likelihood estmiator of (θ1, θ2)
For a uniform distribution, all outcomes are equally likely, so I think you'd use the midpoint. But let someone else answer because I think I'm misunderstanding here.
Feb
5
answered Momentum change in an inelastic collision
Feb
5
comment Lotto Probabilities
Yes, provided you don't choose the similar or overlapping numbers on the 5 tickets.
Feb
5
comment Maximum likelihood estmiator of (θ1, θ2)
Unless I'm seriously missing something, isn't this a uniform distribution if theta1 and theta2 are fixed?
Feb
5
comment Lotto Probabilities
Technically, P(A|B) = P(A) + P(B) - P(A&B), so you'd have to subtract out the probability of winning more than once. If you choose nearly identical numbers on the 5 tickets, this could make a significant difference.
Feb
5
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Feb
4
comment Sampling from a given pdf
OK, that's why I asked if you were looking for a general formula.
Feb
3
comment Calculate volume using flow rate and time difference in a container
If you know the flow rate, I don't see why this would be difficult to calculate?
Feb
3
comment Sampling from a given pdf
Go ahead and give me the constants (or any reasonable constants) and I'll show you what I mean, but I meant using Mathematica or any other tool/technique to numerically integrate your pdf.
Feb
3
comment Proving the primality of these large numbers?
mathworld.wolfram.com/ProbablePrime.html and mathworld.wolfram.com/PrimalityTest.html may be helpful.
Feb
3
comment Application of average and instantaneous rate of change
You could use the product rule to differentiate R(x), but it's probably easier just to multiply it out and then differentiate.
Feb
3
comment how to find value on piecewise cumulative density function
The integral of k/x^2 from 1 to infinity is k, not 1.