Question

6th grade probability problem-yes, I should know how to do this (need a double check)

Answer 1

if 1 carton of milk is selected at random from each store, what is the probability that both cartons will contain chocolate milk?

Answer 2

Store x
type - strawberry 8 cartons
chocolate 12 cartons
skim 20 cartons

Store y
strawberry 9 cartons
cholate 5 cartons
skim 11 cartons

Answer 3

What is your strategy?

Answer 4

store x is 12/40 which is 3/10
store y is 5/25 which is 1/5
not sure if to add or multiply these together
I think it is multiply and the solution s 3/50
my strategy is to guess

Answer 5

I think I am going to go with 3/50 because even if I added them together it would be 1/2 and that is not even a possible solution to choose from

Answer 6

When you want the probability that two events both happen, and the events are independent of each other, then you multiply the probabilities.
You're using intuition.

Answer 7

not sure what key word tells me to multiply

Answer 8

no I am guessing.....it has been a long time since I have done probability

Answer 9

We like to express this as: \[
\Pr(A\cap B)=\Pr(A)\cdot \Pr(B)
\]

Answer 10

yes that is way beyond 6th grade, I have to use a 6th grade brain (I mean approach)

Answer 11

Thanks for the double check

Answer 12

Well, the six grade way would be to count all the possibilities, then to count the 'target' possibilities.

Answer 13

too much work but thanks...........