A bag contains 9 black marbles and 1 white marble. What is the probability of the event that is complementary to the event of drawing a black marble from the bag? A. 1/10 B. 1/9 C. 8/9 D. 2/3

I know 9 + 1= 10 so it's 9/10 but I'm not sure what to do now, could someone help me?

Question

A bag contains 9 black marbles and 1 white marble.   What is the probability of the event that is complementary to the event of drawing a black marble from the bag? 	 	   A. 	  1/10  	   B. 	  1/9  	   C. 	   8/9 	   D. 	2/3    

I know 9 + 1= 10 so it's 9/10 but I'm not sure what to do now, could someone help me?

sydthekid913 · Answer

well after you have drawn one black marble out of the bag how many would you have left?

anonymous · Answer

If you draw one black marble out you'll have 8 left

sydthekid913 · Answer

I mean total :)

asnaseer · Answer

Complementary events are two outcomes of an event that are the only two possible outcomes.

In this case the only possible outcomes are:
a) you draw a black ball
b) you draw a white ball

So, what is the event that is complementary to drawing a black ball?

anonymous · Answer

hmmm, I don't really know. This is all new to me

asnaseer · Answer

You must have been taught something about this if you have been set a question on this.

I just described for you what a complementary event means.

Try to reason out what the complementary event to drawing a black ball would be.

asnaseer · Answer

HINT: The complementary event to tossing a coin and getting heads would be tossing a coin and getting tails.