Tuesday
September 23, 2014

Homework Help: math

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.

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

probability - A bowl contains only red marbles, blue marbles and green marbles. ...
math - There is a jar of 16 marbles. 4 red, 7 blue and 5 green. 1) What is the ...
Math - ***PS: I can't put the diagram so I type it.*** The diagram below shows ...
Math ~ Check Answers ~ - ***PS: I can't put the diagram so I type it.*** The ...
math - A bag contains 3 red marbles, 3 blue marbles and 3 yellow marbles. Which ...
To Steve - Sorry here is completed question A bag contains 3 red marbles, 3 blue...
math - (1) A bag contains 3 red marbles and 5 blue marbles. Jake will choose 2 ...
math - 1.A box contains four red marbles, seven white marbles, and five blue ...
math - An urn contains 5 red marbles, 4 blue marbles, and 3 green marbles. A ...
Math, please check work - A bag contains 7 red marbles, 2 blue marbles, and 1 ...

Search
Members