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March 6, 2015

March 6, 2015

Posted by **Anonymous** on Monday, January 19, 2009 at 9:08pm.

please check my answer

a) explain these events are either dependent or independent.

i think this is independent because the coach just randomly chooses the ball.

b) what is the propability both of the balls will be the ame design color?

is it 98/15.....

- math -
**Reiny**, Monday, January 19, 2009 at 9:33pmSince probability is a value between zero and 1, you should have realized immediately that your answer made no sense.

prob of 2 black balls = 8/15 * 7/14 = 56/210

prob of 2 red balls = 7/15 * 6/15 = 42/210

so the prob of either 2 black OR 2 red balls = 98/210 = 7/15

(notice that the only other possibility would have been to have a black and then a red which would be

2(8/15 / 7/14) = 8/15

and 7/15 + 8/15 = 1 )

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