Science & Mathematics - 21 August 2006

a geologist collected 10 specimen of basaltic rock and 10 specimens of granite.an assistant randomly selects 15 of the specimen for analysis.

a) what's the pmf of the # of granite specimes?

b) what's the probability that all specimens of one of the two types of rock are selected for analysis?

c) what is the probability that the number of granite specimens selected for analysis is within 1 devistation of its mean value.




here're the answers from the back of the book
a) h(x,15,10,20) x=5...10
b) .0325
c) .697


My question is how to approach and solve part C only

thanks a bunch.

2006-08-21 19:25:26 · 3 answers · asked by hyesp24 1 in Mathematics

2006-08-21 19:22:59 · 13 answers · asked by thiyagu 1 in Astronomy & Space

2006-08-21 19:18:31 · 12 answers · asked by John 1 in Other - Science

Just curious!

2006-08-21 19:17:02 · 4 answers · asked by ☼ lovethesun11 2 in Weather

we are making pressure vessels and we have been advise that it is safer to carry out hydro testing as compared to pnuematic testing. Hydro testing tkaes time but with pnumatic testing it is dangerous. and ideas

2006-08-21 19:14:26 · 3 answers · asked by svalrani 2 in Engineering

2006-08-21 19:07:57 · 12 answers · asked by Niranjan 3 in Earth Sciences & Geology

its been reported in the phillipines that a dead one was found

2006-08-21 19:03:22 · 10 answers · asked by Tosha T 1 in Earth Sciences & Geology

Which are your favourites Space Science films? I am not talking of Science Fiction movies, but documentaries. My personal favourites are CARL SAGAN'S COSMOS by and SPACE - BY SAM NIEL (BBC).

2006-08-21 19:01:17 · 6 answers · asked by nene_soberman 2 in Astronomy & Space

2006-08-21 19:00:51 · 9 answers · asked by saravana b 1 in Physics

how would you measure the force that the ball is hit.? is there an actual formula for this???

2006-08-21 18:54:04 · 10 answers · asked by PADMAE 2 in Physics

is there a picture anywhere of a real mermaid or are they really just made up?

2006-08-21 18:51:41 · 13 answers · asked by Tosha T 1 in Earth Sciences & Geology

Nine persons went to a hotel for taking their meals . Eight of
them spent Rs.12 each on their meals and the ninth spent Rs.8 then
the average expenditure of all the nine. What was the total money
spent by them?

2006-08-21 18:45:24 · 18 answers · asked by sudhish n 1 in Mathematics

2006-08-21 18:45:02 · 3 answers · asked by XxheshamxX 1 in Other - Science

2006-08-21 18:43:21 · 11 answers · asked by Anonymous in Astronomy & Space

2006-08-21 18:42:24 · 10 answers · asked by 825 1 in Physics

We control the speed or movements of airplane against gravity by using air thrust. But there is no atmosphere or any other thing like air in space. So space ship sent to the moon or mars simply fall on surface of the moon or mars due to the gravitational attaction of the moon or mars. On the otherhand, the ship can not take off from their surface against their gravity in absence of air(which creats thrust).

2006-08-21 18:38:59 · 9 answers · asked by maheswar_ojha 1 in Astronomy & Space

how fast is the speed of sound?

2006-08-21 18:34:29 · 12 answers · asked by Music Man 2 in Other - Science

2006-08-21 18:16:29 · 6 answers · asked by greaseymikey 1 in Mathematics

As a chemist I had to check out the 'chemistry' section of Yahoo questions. I figured I would tackle a few questions as a way to repay the folks that have been answering my 'lawn and garden' questions. I do believe that we chemists are doing the homework for the next batch of chem graduates. I hope they are thinking about their questions critically and not blindly posting them.

This is really an inappropriate post, but this seemed to be the place to hit the right audience.

Be well all,
-B

2006-08-21 18:16:17 · 11 answers · asked by Yacoff 1 in Chemistry

2006-08-21 18:11:38 · 10 answers · asked by meaw 1 in Biology

Mars will look as large as the full moon to the naked eye.
and reach its azimuth at about 3 a.m.

By the end of August when the two planets are closest, Mars will rise at nightfall and reach its highest point in the sky at 12:30a.m. That's pretty
convenient to see something that no human being has seen in recorded history. So, mark your calendar at
the beginning of August to see Mars grow
progressively brighter and brighter throughout the
month.


Share this with your children and grandchildren.

NO ONE ALIVE TODAY WILL EVER SEE THIS AGAIN

2006-08-21 17:54:34 · 8 answers · asked by amac79 2 in Astronomy & Space

I got an email a month ago and this is what it says:
We'll never see this again!
...nor will the people of the next 50-to-1,000 Life Times!

Mars, the Red Planet is about to be spectacular!

This month and next, Earth is catching up with Mars in an encounter that
will culminate in the closest approach between the two planets in recorded
history. The next time Mars may come this close is in 2287. Due to the way
Jupiter's gravity tugs on Mars and perturbs its orbit, astronomers can
only be certain that Mars has not come this close to Earth in the Last
5,000 years, but it may be as long as 60,000 years before it happens
again.

The encounter will culminate on August 27th when Mars comes to within
34,649,589 miles of Earth and will be (next to the moon) the brightest
object in the night sky. It will attain a magnitude of -2.9 and will
appear 25.11 arc seconds wide. At a modest75-power magnification...

Mars will look as large as the full moon to the naked eye....more....

2006-08-21 17:51:58 · 16 answers · asked by amac79 2 in Astronomy & Space

2006-08-21 17:48:18 · 22 answers · asked by Don't Fear the Reaper 3 in Biology

We are looking for statistical treatment to use in our research to determine the reliable number of samples to test.

2006-08-21 17:48:06 · 2 answers · asked by jm_september09 1 in Mathematics

mars is known as the red planet so is uranus brown ???

2006-08-21 17:47:44 · 11 answers · asked by robbo 1 in Astronomy & Space

The basis for the compounds that make up all living things?

2006-08-21 17:46:09 · 9 answers · asked by Nodoudt 2 in Chemistry

I have loaded 20 different photographs at the site below of a space ship. It was taken on film so no photoshop theories. They were taken on 3 different rolls of film on 3 different days. The first album was shot on two different days in 2004 over a period of about 20 minutes which you can tell because the moon has moved but the space ship is stationary. The second album is from 2005.The space ship is infra red and was invisible at the time. As the moon is in a different position each time, it means the ship had to line up with my camera in order to be in the shot, and then stay completely motionless for around 20 minutes. Other photographs were taken of the moon on other days and no other lights were visible. in the background you can see stars, something that is impossible without the aid of the infra red unless you have a very much longer exposure. http://www.fopix.net/NOW/ If you dont believe it is a space ship(it is) please explain what you think it "really" is.

2006-08-21 17:44:13 · 6 answers · asked by ByeBuyamericanPi 4 in Astronomy & Space

2006-08-21 17:43:13 · 2 answers · asked by T.B.Rao 1 in Engineering

put these in order from smallest to biggest atom, biome, biosphere, cell, community, ecosystem, electron, galaxy, molecule, organ, organ system, organelle, organism, population, proton, quark, solar system, tissue, and universe

2006-08-21 17:43:05 · 4 answers · asked by Anonymous in Astronomy & Space

2006-08-21 17:41:36 · 6 answers · asked by Anonymous in Mathematics