Question

STATISTICS: A person with type O-positive blood can receive blood only from other type O donors. About 44% of the population has type O blood. At a blood drive, how many potential donors do you expect to examine in order to get three units of type O blood?

Answer 1

5

Answer 2

@Rohangrr , that's not allowed.

Answer 3

and, that's not the right answer either.

Answer 4

@inkyvoyd u answer then

Answer 5

@Rohangrr , I mean that you are not spposed to give a direct answer.

Answer 6

and, @karatechica , first, we find the equation that describes this situation.

Answer 7

@inkyvoyd this is the answer
if 44% of the population have type O blood, then the chances of each person being type O are 1/0.44 against.
This is 2.27 to 1 against.
So you would expect to have to examine 2.27 people ( this is statistics!) to expect one of them to be type O.
If you examine 2.27*3 people, you would expect 3 of them to be type O.
This is the answer to the question - you would expect to have to examine 6.8 potential donors in order to get 3 units of type O blood. (In reality, you would be looking to examine 7 potential donors!)

Answer 8

0.44x=3. We are "expecting" 3 units, and the probability of getting a unit is about 44% (because the population of people with O blood is 44%; 44% of people that are blood donors are most likely O blood)

Answer 9

@Rohangrr , it's not that I didn't understand what I'm doing, it's just that I was annoyed that you answer sniped and gave the wrong answer.

Answer 10

@inkyvoyd okay !! now take a chillpill!

Answer 11

I'm not the one answer sniping, bro.

Answer 12

chill !

Answer 13

I don't need to chill if I'm not angry man. I'm just annoyed that you broke the CoC and gave the wrong answer.

Answer 14

heyy let's be civil ! :) Thank you guys for your help!

Answer 15

@karatechica SHE WILL DECIDE WHICH ONE IS THE BETER

Answer 16

@Rohangrr , the explanation you gave afterwards was good, but it didn't have an answer consistent with your original answer.

Answer 17

@inkyvoyd yours is the wong

Answer 18

How can mine be wrong if I never gave an answer?

Answer 19

All I gave was an equation.

Answer 20

how about you two duke it out with another question lol

Answer 21

In addition, I was going to give a reply as to rounding associated with the equation, ut I never got to it.

Answer 22

Eh, sure, close this one, post another you need help in. You do understand this one, right?

Answer 23

yeah for the most part! :)

Answer 24

Basically, the equation you seek to slve is 0.44x=3, but you must round it to the nearest number because people must be in whole numbers.

Answer 25

@Rohangrr: Copy pasting answers is not a good idea, you can always mention the source and avoid all confusions.

http://answers.yahoo.com/question/index?qid=20111130233534AAbjLJZ

Answer 26

Uhm. @FoolForMath , you just made me rage all the more.