Probability: a bag has 10 balls, 4 are red. Ramona picks a ball, its read and she puts it back into the bag. Carlos picks one. what is the probability that he will pick a red ball?
I thought the answer would have been 4/10 ?
Im confused .

Question

Probability: a bag has 10 balls, 4 are red. Ramona picks a ball, its read and she puts it back into the bag. Carlos picks one. what is the probability that he will pick a red ball?
I thought the answer would have been 4/10 ? 
Im confused .

agent0smith · Answer

You're correct, if there's 4 red balls and 10 balls total, the probability is 4/10. 

The fact that Ramona picked a red ball (and replaced it) does not affect the chance of Carlos picking a red ball - the two events are independent (one doesn't affect the other).

geerky42 · Answer

attachment

agent0smith · Answer

Medal for John Candy.

anonymous · Answer

the answer is wrong however, should I simplify or something?

geerky42 · Answer

Yeah, you should simplify.

agent0smith · Answer

Yes, you can simplify 4/10 by dividing the numerator by 2 and denominator by 2.

anonymous · Answer

so it is 2/5 ! :) thank you guys! :)

agent0smith · Answer

Yep :) and no prob. 4/10 was still a correct answer, just not in the most simple form.