Science & Mathematics - 14 December 2006

let x be a continuous random variable with density function

f(x) = (1/(x^2)) for x>=1
and
f(x) = 0 everywhere else.

how do you find P(X=2)?

i know how to find inequalities for these type of problems but i can't figure out equality. I know the answer is 0 but how do we get that?

2006-12-14 04:16:06 · 4 answers · asked by Napper 2 in Mathematics

Just as a mathematical puzzle. My room has six walls connected at six right-angles. Roughly what shape is my room?

2006-12-14 04:15:29 · 12 answers · asked by Anonymous in Mathematics

a student has earned scores of 87,81,and 88 on the first 3 of 4 tests. If the student wants an average ( arithmatic meaning) of exactly 87, what score must she earn on the fourth test?

2006-12-14 04:14:48 · 24 answers · asked by Anonymous in Mathematics

And don't say people. :-)

2006-12-14 04:13:49 · 22 answers · asked by Anonymous in Zoology

was it that Einstein guy

2006-12-14 04:13:47 · 21 answers · asked by Anonymous in Biology

2006-12-14 04:08:17 · 16 answers · asked by Anonymous in Physics

can anybody here give me a tree of computer generations?! its like a family tree.. but its about computer generation.. thankz

2006-12-14 04:06:56 · 2 answers · asked by GuReiSU 2 in Mathematics

Hawkings just said something like to save the humanity, we need to go to space

2006-12-14 04:06:15 · 25 answers · asked by HeatherPR7 1 in Astronomy & Space

"A rectangular prism has a volume of 960 cm cubed (I don't know how to put the little 3 sign). Its width, length and height are in the ratio 3:5:8 a) determine the dimensions of the prism b) what is the ratio of the left side to the front to the top of the prism by face surface area c) calculate the surface area of the prism. Can anyone help with this? Thanks."

2006-12-14 04:02:43 · 6 answers · asked by Anonymous in Mathematics

2006-12-14 04:02:32 · 9 answers · asked by Anonymous in Astronomy & Space

2006-12-14 04:00:54 · 2 answers · asked by K Ð 1 in Engineering

2006-12-14 03:59:46 · 1 answers · asked by Anonymous in Biology

4/x+1/y=5/3
1/x-3/y=3/2

Could you pls explain step by step the process to solve the simulataneous equations.

2006-12-14 03:58:56 · 10 answers · asked by SHIBZ 2 in Mathematics

2006-12-14 03:58:28 · 2 answers · asked by Anonymous in Geography

It is just theory?

2006-12-14 03:57:35 · 13 answers · asked by blue_eyed_woman_23 3 in Biology

2006-12-14 03:56:30 · 12 answers · asked by Anonymous in Astronomy & Space

2006-12-14 03:56:12 · 8 answers · asked by Anonymous in Engineering

how do you make a hinge for a folding drawbridge with 1/8 x 1/8in
balsa wood, popcicle sticks, rope, lego gears, glue. I NEED ANSWERS!!
Please help

2006-12-14 03:54:04 · 2 answers · asked by mb13 2 in Engineering

Is it a green type of tube?

2006-12-14 03:53:34 · 2 answers · asked by miami_relatives 1 in Engineering

2006-12-14 03:52:40 · 2 answers · asked by planck12 1 in Astronomy & Space

I am going to write an essay about cloning, but being a very broad subject, I have narrowed it down to the cloning of animals. Some people say that cloning is wrong because there is no need to create more animals when there are so many homeless ones in the world. They also claim that clones tend to develop health complications, so why "create" life just for it to suffer? The other side holds to the belief that the amazing science of cloning can be used to save endangered (or even extinct) species. The animal will be cloned, and once there are enough, they will start breeding naturally. Some have even gone so far as to say they will bring back dinosaurs (hmmm...sounds familiar...Jurassic Park maybe?). As for the health problems, scientists have successfully cloned and kept alive many endangered African wild cats. The cats have even had kittens naturally, proving that they are healthy. It has been a while since Dolly was cloned, and cloning has been improved. So, what is your opinion?

2006-12-14 03:52:18 · 9 answers · asked by Anonymous in Biology

2006-12-14 03:51:20 · 10 answers · asked by Anonymous in Geography

2006-12-14 03:50:16 · 5 answers · asked by The Question Man 2 in Physics

In anaphase of mitosis, the chromosomes move to opposite ends of the dividing cell. The movement of the chromosomes requires cellular energy. This type of movement is an example of _______________.

dynamic equilibrium

natural balance

active transport

passive transport

2006-12-14 03:49:53 · 3 answers · asked by ♫ Think happy thoughts ♪ 3 in Biology

2006-12-14 03:49:53 · 6 answers · asked by The Question Man 2 in Chemistry

2006-12-14 03:49:36 · 10 answers · asked by DJ ä¸?ä¸? 1 in Zoology

2006-12-14 03:47:58 · 23 answers · asked by Anonymous in Zoology

2006-12-14 03:46:52 · 4 answers · asked by charo 2 in Other - Science

A block of mass "m" is moving on a horizontal frictionless surface with a speed of "v sub 0" (initial velocity) as it approaches a block of mass "2m" which is at rest and has an ideal spring attached to one side, (the side where the impact will occur). When the two blocks collide, the spring is completely compressed and the two blocks momentarily move at the same speed, and then separate again, each continuing to move.

A.) Briefly explain why the two blocks have the same speed when the spring is completely compressed.

B) Determine the speed "v sub f" (the final velocity) of the two blocks while the spring is completely compressed.

C) Determine the kinetic energy of the two blocks as they move together with the same speed.

D) Write the equations that could be used to solve for the speed of each block after they have separated. It is not necessary to solve the equations for the two speeds.

2006-12-14 03:45:32 · 3 answers · asked by Robin 3 in Physics

2006-12-14 03:45:28 · 5 answers · asked by olarewaju k 1 in Physics