Question

Help Please!

Answer 1

http://en.wikipedia.org/wiki/Binomial_distribution#Probability_mass_function

Answer 2

I need help finding what f(k,n,p) are. I know n=7 but the other two I am not sure..

Answer 3

@ganeshie8 Help...

Answer 4

\(\large P(X = k) = ~^nC_k~ p^k(1-p)^{n-k}\)

Answer 5

where,

\(n\) : number of times experiment was conducted
\(k\) : number of successes
\(p\) : probability for success

Answer 6

plugin the values ?

Answer 7

I am unsure what the probability is in this problem =( is n=7?

Answer 8

\(n = 7\)

\(p = \frac{1}{2}\)

Answer 9

\(\large P(X = 0) = ~^7C_0~ (\frac{1}{2})^0(1-\frac{1}{2})^{7-0} \)


\(\large P(X = 1) = ~^7C_1~ (\frac{1}{2})^1(1-\frac{1}{2})^{7-1} \)

Answer 10

Alright, I always get confuse with finding the probability in word problems... But, Thank You I can now continue with the rest of my h.w =)

Answer 11

np :) good luck !
you might consider doing this without using binomial theorem directly

Answer 12

ok ^.^

Answer 13

we can think of P(X = 0) like this :
probability for not having any heads

Answer 14

which is same as probability for having all tails

Answer 15

since we're tossing it 7 times,

probability for tails all 7 times = 1/2 * 1/2 * 1/2 * 1/2 * 1/2 * 1/2 * 1/2 = (1/2)^7

Answer 16

binomial formula is just a compressed version of above calculation ^

Answer 17

Got it Thanks =)