I need help with probability and the counting principle

- anonymous

I need help with probability and the counting principle

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- schrodinger

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- amistre64

how sophisticated do you need to go?

- amistre64

I got a rudimentary understanding of probability

- anonymous

6th grade level
it doesn't make sense to me

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## More answers

- amistre64

give us a problem and lets see if we can work thru it :)

- anonymous

ok thanks

- anonymous

how many different words can be
made using the words quick, slow, and sad and the suffixes
-ness, -er, and -ly.

- anonymous

is the answer 9

- amistre64

so we have 4 words, and 3 endings. right?
each word can be made 3 times; sadness, sadder, sadly...
you do that 4 times and you get 12 words.
theres a "tree" you can form" but Id have to go to paint to do it...

- anonymous

three words and three endings

- amistre64

yeah...I saw 4 words...that was my mistake :)

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- amistre64

the concept is the same tho....so yeas, 9 :)

- anonymous

this is difficult to explain without drawing pictures

- anonymous

I need to know the probability of two colored spinners and stuff like that

- amistre64

write it out, lets see if I can understand it :)

- anonymous

Great! Thanks for being so patient

- anonymous

Here goes...

- anonymous

a coin is tossed, and a letter is
chosen from a bag . The letters in the bag are X, P, Z, K, M, A, E, Y
11. How many outcomes are possible?
12. Find P(heads, E).
13. What is the probability of tails and P, Z, or M?

- anonymous

I don't understand what the coin has to do with it

- anonymous

I'm never gonna get this

- amistre64

the coin is jsut an additional "variable" in it....
you start with the coin toss, which is 50% chance of getting heads or tails right?

- anonymous

yes

- amistre64

ther are 2 outcomes from the coin toss, and 8 outcomes from the letters in the bag right?
16 outcomes total correct?

- anonymous

I think I was making it harder thatn it actually was

- anonymous

thank you

- amistre64

youre welcome, sometines all it takes is a fresh set of eyes :)

- anonymous

but wait

- anonymous

Can I just run this by you to make sure I understand everything

- amistre64

P(heads,E) I would assume means (100/2,100/16)
sure run it by me..

- amistre64

50% and 100/8 actually... 12.5%
P(50%,12.5%)

- anonymous

yikes I think I'm lost again

- anonymous

how did you get 100 over 8

- amistre64

I dont quite understand the notation P(heads,E) but to me it would mean that there is a 1 in 2 chance of getting heads: 100/2 = 50%
and a 1 in 8 chance of getting an "E"; 100/8 = 12.5%

- anonymous

oh ok

- amistre64

100 is just the "percent" number.... I use it to adjust for the "chances" into an actual percentage

- anonymous

what are independent vs. dependent events

- anonymous

Believe it or not I do well in math but this probability stuff is confusing to me

- amistre64

when 2 things happen without a cause, they are independant of each other. The snow falling in alaska and my shoe coming untied in NewYork are not related, they are independant of each other.
the opposite of that is events that occur because of the other. like:
The light was off, I stubbed my toe.

- anonymous

cool analogy but how do I apply it to this unit on probability

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