Posted by **Preston** on Thursday, January 25, 2007 at 6:46pm.

A bag contains red, blue, and orange marbles. If the probability of randomly selecting a red marble is 0.4 and the probability of selecting a red or blue marble is 0.9 what is the probability of selecting a red or orange marble?

In my opinion, the easiest way to solve these kinds of problems is to assume that you have 100 marbles in a bag.

If 40% are red, then 40 marbles are red.

If 90% are red or blue, then 90 marbles are red or blue.

And so forth.

that doesnt make any sense to me

Just assume that you have 100 marbles. It makes the question much easier to solve rather than assuming that you have some random number x of marbles.

- math -
**steve**, Friday, April 24, 2015 at 4:18am
4 red,4 white,4 blue

at random take out 2 , say 1 red 1 white do not replace.

what is probarbility of now picking a)blue

b)red c)white

## Answer This Question

## Related Questions

- math - In a jar there are 4 red marbles 5 green marbles and 7 blue marbles. 1 ...
- statistics - a jar contains red and blue marbles. two marbles are chosen without...
- math plz help - The contents of a jar holds 4 red marbles, 7 blue marbles, and 5...
- math - There is a jar of 16 marbles. 4 red, 7 blue and 5 green. 1) What is the ...
- probability - A bowl contains only red marbles, blue marbles and green marbles. ...
- Math - ***PS: I can't put the diagram so I type it.*** The diagram below shows ...
- algebra PLEASE HELP ASAP - please show me the steps that you use to solve the ...
- math 2 - a bag contains 8 blue marbles 6 red marbles and 4 green marbles .What ...
- math - A bag contains 3 red marbles, 3 blue marbles and 3 yellow marbles. Which ...
- math - A bag contains 3 red marbles and 6 blue marbles. What is the probability ...

More Related Questions