Probablity

ok so i have a really slow math teacher who goes so slow we didnt even Start Probability. Ok so explain this to me
a) when do you use nCr and nPr (I think i know but i want to make sure)
b) if i am flipping a coin what is the probability of me getting head exactly 6 of the 8 times (I think you use nCr p^(something)(1-p)^(something)
c) if i am flipping a coin what is the probability of me getting heads at least 6 of the 8 times?

LMAO! Lev all of your math teachers classes are going to fail tomorrow ...my teacher did Probability 2 months ago. lol

a)If the order doesn't matter, it is a Combination. If the order does matter it is a Permutation.

Ill answer b and c later

Thanks Ahmed. btw lads i got the regent tomrw so yea...

Lev...don't talk British man...it's "guys" not "lads"

Oh yeah, I am also taking the regents tomorrow -Trigonometry and Algebra II here I come

Now

For b) 8C6 (.5)^6 x (.5)^2

For c) 8C6 (.5)^6 x (.5)^2 + 8C7 (.5)^7 x (.5)^1 + 8C8 (.5)^8 x (.5)^0

Can you tell me the general formula mate?

Sorry I'm not British.

Hey Lev what room will you be in tomorrow? Come to 6E18...I invited the gang.

i am in 5E18

Ok so just go up one floor. lol

yep. and wow we have the only two people on this forum Smexy was just on

Yeah...he was...he's reading the forum as a guest...he doesn't like to cause distractions with his smexiness yano ?

BTW do you have a soccer ball? PLEASE BRING IT!!!

What is the Probability that we will play with a busted ball?

0% because you have a good soccer ball

Fine...do you have a basketball? Or do you know where we could find a wall?

what on Earth is this? O.O
i did a whole year on probability and i neva came across any of this stuff

You're still not at our level.

I smoked my first regents

Ahmed IV wrote:You're still not at our level.

dude... i'm at a higher level

Don't lie to your self Marwa. Our school is pretty advanced . make other schools look like they are in the stone ages.

nah man... the further maths ppl took the stuff u was talkin about last year. I just dropped the subject coz i can't juggle 5 subjects

Our school is more advanced Marwa simply because its not a regular school like the one that you go to .

How was the exam lev

The freaking radical simplification question got me good ...I stared at it for 20 minutes till my brain broke free from its freeze lol

NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO!

I got half a question wrong

Lev you know the graph that we had to draw...it said write the equation of its ______ ...I didn't know that word ...I thought it meant inverse.

Easy it took me 90 minutes to do it. i saw mailman was grading the finals. btw u didnt even walk in to say Hi. all you did was wave your hand and u didnt say anything

the one with the linear regression?

I was waving my hand to you, you noob...she didn't look at me so I didn't have to say anything lol

Also there was no linear regression you fool!

I am talking about the oen wehre you had to draw the graph of y=(1/2)^x

i go to a language, business and enterprise sixth form college... it ain't a regular high skl either son