# How to figure out binominal distribution

• June 4th 2009, 05:41 PM
krzyrice
How to figure out binominal distribution
Here is the question:

I need help figuring out what is the success rate of this. Thanks for your help.
• June 4th 2009, 05:57 PM
pickslides
$
P(A\cup B) = P(A)+P(B) = \frac{1}{4} + \frac{1}{8} = \frac{2}{8} + \frac{1}{8} = \frac{3}{8}
$

(Rofl)(Rofl)(Rofl)
• June 4th 2009, 06:12 PM
krzyrice
Thank you for help pickslides.

However, I am now stuck on figuring out part a)
It tells you it is spun once.
So is the answer 1C1 x (.375)^1
• June 4th 2009, 06:22 PM
pickslides
My answer is correct for 1 trial.

Using the binomial theorem

$
P(A \cup B) = \binom{1}{1}\left(\frac{3}{8}\right)^1\left(\frac{ 5}{8}\right)^0 = \frac{3}{8}
$
• June 4th 2009, 06:44 PM
krzyrice
Excellent explanation. Thanks!