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**new homework Question**

D

dowxp

Diamond Member
NEW:
an easter egg basket contains 5 red and 3 blue eggs. 4 eggs are drawn at random without replacement. how many ways are there to choose wthe following?

1) all red eggs
2) all green eggs
3) 2 of each
4) 3 re d and 1 blue

just for details - this is for my roommate, we are in college, at the university of texas. and yes, i dont know how to do it. and im in calculus as an entering freshman in EE. my roommate is an art major taking intro to math.


OLD:
i dont know probabliilty...

if 15 coins are tossed, what is the probability of at least 3 tails?
 


<< i dont know probabliilty...

if 15 coins are tossed, what is the probability of at least 3 tails? >>



i don't know the exact figure, but i would say the probability is pretty good.
 
1 - probability of just 1 tail - probability of just 2 tails. I forgot how to calculate those, but I think if you use the nCr (combination) button on your calculator, you can do it 🙂
 
P(at least 3 tails) = 1 - P(2 or less tails)

start with total possibilities = 2 ^ 15 = 32768

possibilities w/ 0 tails = 1
possibilities w/ 1 tails = 15 c 1 = 15
possibilities w/ 2 tails = 15 c 2 = 105
so P(2 or less tails) = (1 + 15 + 105) / 32768 = 121/32768

P(at least 3 tails) = 1 - 121/32768 = 32647/32768 or 0.9963

hope i didn't make any mistakes... 😛
 
good for you swai, you've managed to deprive a young learner the opportunity to enjoy the marvel of self-discovery. instead, you've taught him, or encouarged him to beat the system....1 year from now, when he drops out of high school because he failed out, you should be the one paying his welfare check ok?
 


<< good for you swai, you've managed to deprive a young learner the opportunity to enjoy the marvel of self-discovery. instead, you've taught him, or encouarged him to beat the system....1 year from now, when he drops out of high school because he failed out, you should be the one paying his welfare check ok? >>



lol
 
i dropped out of HS because of ppl who helped me cheat...the system failed me...I just hope to nip the bud... its because i suck at math that i came up with 1/5 ok?
 
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