Question

I need to know if I use the Poisson Distribution for problem 5 (A-C).

Answer 1

No use the Binomial distribution
p= 1/3 for tie
p=1/6 for "0-0" tie

Answer 2

so i would use this formula:
P^k * (1-p)^n-k
and for part A, I would plug in 10 for n and 3 for k???

Answer 3

@jim_thompson5910 @karatechopper @JuanitaM

Answer 4

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

Answer 5

n=10 and k=3

Answer 6

so im correct. woohoo! :D

Answer 7

haha :)

Answer 8

ok, so i get .0021676912. is that the final answer or is there anything else i needa do?

Answer 9

for part A ?

i get about 0.26

Answer 10

yeah, how'd u get .26 ??

Answer 11

just plugged numbers in formula ... well i cheated and used Excel :)

p = 1/3
n=10 k=3
\[\rightarrow \left(\begin{matrix}10 \\ 3\end{matrix}\right)*(\frac{1}{3})^{3} *(\frac{2}{3})^{7} = 120*\frac{128}{3^{10}} = 0.2601\]

Answer 12

im confused about the second half...
after the first equal sign

Answer 13

\[\left(\begin{matrix}10 \\ 3\end{matrix}\right) = \frac{10!}{7! 3!} = 120\]
\[(\frac{1}{3})^{3} *(\frac{2}{3})^{7} = \frac{1}{3^{3}}*\frac{2^{7}}{3^{7}} = \frac{2^{7}}{3^{10}} = \frac{128}{59,049}\]

Answer 14

ok. so i was getting .0021676912 because i didn't multiply it by 120. makes sense.

Answer 15

so for part B i would just change p to 1/6 ??? (why 1/6 again?)
and for part C i would do 1-part B ???

Answer 16

its 1/6 because its half of 1/3 --> 1/3 * 1/2 = 1/6

part C is looking at chance you tie but Not 0-0
--> 1/3 - 1/6 = 1/6

Answer 17

o because half would equal zero-zero ??

Answer 18

right

Answer 19

and part Cs answer will basically be the same as part B since they're both p=1/6?

Answer 20

umm yep thats what it looks like

Answer 21

ok coo ! :)

Answer 22

alright, so im on #7 and it's wanting the same info as #6 but normally distributed...
would i use : f(x)= ( 1 / [sigma * sqrt(2pi)] ) * e ^ (x-mu/sigma)
to plug in the same info from 6???

Answer 23

here are the answers to #6:
a) picture
b) 1/(b-a) = 1/(210-150) = 1/60
c) (160-150)/(210-150) = 10/60 = 1/6
d) 1/6 * 1/6 = 1/36
e) (185-165)/(210-150) = 20/60 = 2/6
f) (210-200)/(210-150) = 10/60 = 1/6