Science & Mathematics - 24 October 2007

Suppose you have the following probability mass function for the three random variables A, B, anc C:

P_(A,B,C) of (0,0,1) = 5/36
P_(A,B,C) of (0,0,2) = 1/36
P_(A,B,C) of (0,1,0) = 3/36
P_(A,B,C) of (0,1,4) = 3/36
P_(A,B,C) of (0,2,2) = 1/36
P_(A,B,C) of (0,2,3) = 5/36
P_(A,B,C) of (1,0,3) = 2/36
P_(A,B,C) of (1,0,4) = 4/36
P_(A,B,C) of (1,1,2) = 6/36
P_(A,B,C) of (1,2,0) = 4/36
P_(A,B,C) of (1,2,1) = 2/36

How would one find the expected value of B?

2007-10-24 06:47:05 · 2 answers · asked by cornzxo 1 in Mathematics

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I've always tried to be the kind of person who does really well in school/college, has time to spend with family and friends, works part-time, and still manages to help people by doing volunteer work.

So far I have not succeeded.
If I get a job, my marks suffer... if go out with friends or family, I have no time for this and that.... how do you get out of this constant stuggle?

2007-10-24 06:44:05 · 8 answers · asked by Anonymous in Biology

I know how to do them like this..

1/2 meaning one half
and
4^2 meaning four to the power of two
But I want to know how you do it correctly.
I have seen some people do it on here, and I just would like to know how to do it myself. Thanks.

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The specific heat capacity of silver is 0.24 J/°C·g.

Calculate the energy required to raise the temperature of 1.0 mol Ag by 1.0°C (called the molar heat capacity of silver).

answer should be in J/mol C

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The majority of scientists seem to concur that the universe began with "the big bang" what do you think existed before the big bang? I cant understand that at some point there was simply "nothing" as surely there must always be "something" if you understand my point. Arcane subject I know.

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Does he get bored cause he has been living 4 ever and will in the future live 4 ever!!!

You opinion/guess/creativeness is welcomed

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2007-10-24 06:33:25 · 2 answers · asked by Anonymous in Chemistry

A) Mitosis is used for growth and tissue repair in animals
B) Meiosis is a form of asexul reproduction
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D) in meiosis, the chromosomes replicate only once
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2007-10-24 06:32:30 · 2 answers · asked by mira 4 in Biology

If so where would the reaction occur at??(Newton's third law) action has equal opposite reaction, if we (what we do) is the action where could we find the reaction

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(1) 0.0m/s (2) 1.6m/s (3) 4.9m/s (4) 9.8m/s

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The US has had 50 years experience in space exploration over most other countries. Is this experience more or less 'legacy' type, meaning could China or Japan for example, pretty much jump in and pick up where the US is now? Is what was gained in those 50 years by the US more or less common knowledge to today's scientists?

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In winter air condition condenser take ice especial wen the temperature is coming under zero degree
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why?

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A gas has a volume of 8 liters at 1.0 atmosphere of pressure, 25 degrees Celcius. If the temperature and pressure are increased to 67 degrees Celcius and 4 atmospheres, what is the new volume, in liters, of the gas?

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Find the most general antiderivative of the function. (Check your answer by diffferentiation.

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Abiotic factors have no effect on the living organisms of an environment.

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Need help with this physics problem. How do you go about figuring it out?

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I am working on a report on the Temperate grasslands, savannas, and shrublands biome. I need information about this biom, especially the animals

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I was on 4, just curious.thanks.

Wikipedia elaborates:
On March 23, 1989 the 300 meter (1,000-foot) diameter Apollo asteroid 4581 Asclepius (1989 FC) missed the Earth by 700,000 kilometers (400,000 miles) passing through the exact position where the Earth was only 6 hours before. If the asteroid had impacted it would have created the largest explosion in recorded history, thousands of times more powerful than the Tsar Bomba.

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I have a great deal of experimental data; it all roughly fits a sine wave. I have been working out the period manually by identifying the peaks and troughs, on an Excel graph; it takes ages... Is there a function, or Data Analysis tool which is able to calculate the period? (The amplitude get small exponentially as well). If not could I make a macro that does the same thing?

Help! Thank you!

2007-10-24 06:15:24 · 3 answers · asked by Anonymous in Physics

A jungle veterinarian with a blow-gun loaded with a tranquilizer dart and a sly 1.5-kg monkey are each a height h above the ground in trees a distance L apart. Just as the hunter shoots horizontally at the monkey, the monkey drops from the tree in a vain attempt to escape being hit.

What must the minimum muzzle velocity of the dart have been for the hunter to hit the monkey before it reached the ground?
Take free fall acceleration to be g.

cant find the answer for the life of me.

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can u classify each triangle by its angles and by its sides

okay... triangle means: the symbol that looks just like a triangle

triangleWHO, with m

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i was talking to a friend of mine about his 22 years as a submariner and I asked him if it ever occurred to him that to sail a sub underwater, it had to be in a dive the entire time since the earth is not flat.

he thought about it for a while and said, 'that's deep, lets have an other beer'

what are your thoughts on traveling underwater at a constant depth

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What quantity of heat is required to warm 57.7 g of liquid water from 0°C to 100°C?

i dont get how to do this problem..please help

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Why was the BIG BANG the chosen method? Were other options available and why is the ecosystem so sensitive

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