1. What is the probability of getting 6 tails outta 9 fair coin tosses?
With the example above set up the problem this way:
1) (n, k)
n= total number of tosses=9
k= number of interest =6 (you want 6 tails)
SO, (9,6)
Pluge 9 and 6 into this equation (you'll love it )
n!
------- X P(favorable)^k X P(unfavorable)^(n-k)
k!(k-n)!
(!) means factorial. Forexample 3! = 3X2X1
(P) means probability
(^) means exponent---"to the"
(X) means multiplied by---its not a variable
Therefore:
9!
---------- X (1/2)^6 X (1/2)^(3) = 0.164 or ~1/6.25
6!(9-6)!
I calculated it on the computer, so I may be totally wrong, but the equation is right.
2. Third expansion factor of (X +3)^5 ?
Beats me
😛 😕
