Thursday

September 18, 2014

September 18, 2014

Posted by **A** on Friday, August 15, 2014 at 12:23pm.

- math -
**PsyDAG**, Friday, August 15, 2014 at 1:15pmIf the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

For blue = 4/6 * 3/5 = 2/5

For green = 2/6 * 1/5 = 1/10

Either-or probabilities are found by adding the individual probabilities.

2/5 + 1/10 = ?

- math -
**A**, Friday, August 15, 2014 at 1:18pm2/5+1/10 is 5/10.

But in my book it states that the answer is 7/15, without an explanation.

- math -
**Reiny**, Friday, August 15, 2014 at 11:29pmEither two blues or two greens

prob of 2 blues = (4/6)(3/5) = 2/5

prob of 2 grees = (2/6)(1/5) = 1/15 , this is where PsyDAG slipped up

so prob of 2 of same colour = 2/5 + 1/15 = 7/15

- math -
**PsyDAG**, Saturday, August 16, 2014 at 1:50pm⁄Mia Culpa! Sorry.

**Answer this Question**

**Related Questions**

Probabilities - A jar contains 2 red marbles, 3 green marbles, 4 blue marbles, ...

Statistics - 1.In a jar, suppose there are 3 blue marbles, 2 yellow marbles and ...

Math - Can someone please explain how to solve this problem? A bag contains 6 ...

Math - given a jar contains four marbles, each a different color: red, blue, ...

Math - A jar contains 5 red marbles and 3 green marbles. A marble is drawn at ...

Math - A box contains four red marbles, seven white marbles, and five blue ...

probability - A set of five marbles is selected (without replacement) from a bag...

math - Eighteen marbles are dropped into a jar. There are 8 black marbles, 7 red...

math - Suppose a jar contains 5 red marbles and 33 blue marbles. If you reach in...

Algebra - Out of jar with 100 marbles, 49 are blue marbles, 7 are green marbles...