Question

Probability question!

Answer 1

I already got a, b ,c I just don't really get d.

Answer 2

what do you mean a b c d? maybe 17 18 19 20?

Answer 3

i already solved a, b, c, i don't really know how to do d.

Answer 4

i cant see neither a nor b nor c nor d

Answer 5

oh! ugh sorry i feel so stupid! yes i mean 18, 19, 20

Answer 6

by d i mean 20. so sorry!

Answer 7

have you learn conditional probability?

Answer 8

let's find probability of no pasta

sharon's no pasta =.3*.25

lisa's no pasta= .7*88

add them up , this is probability of not having pasta

Answer 9

our question

what is probability that lisa cook the dinner GIVEN that there is no pasta

Answer 10

http://upload.wikimedia.org/math/8/6/9/8694e4193ba45b55403595096b7d23c5.png

Answer 11

P(lisa cook dinner) ∩ P(no pasta)
-----------------------------
P(no pasta

Answer 12

shouldnt be p(no pasta)=.7*.88+.3*.25=0.691

Answer 13

yes

Answer 14

so we have to figure out the intersection thing

Answer 15

so probability of no pasta is
0.691

probability of lisa cookinging and no pasta is
.7*88=.616

.616/.691=.891

Answer 16

yay correct :D