Help me figure this out?

- briana.img

Help me figure this out?

- jamiebookeater

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- briana.img

##### 1 Attachment

- briana.img

This table is confusing and I don't know how I should be looking at it.

- briana.img

I've be doing 264/629 * 47/629 and other variations but it doesn't seem to work

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## More answers

- anonymous

is there any answer choices??

- briana.img

0.054
0.375
0.264
0.507

- anonymous

oh my bad i didn't see tha screen shot

- briana.img

it's alright lol

- anonymous

i see a pattern in ther tho

- anonymous

*there

- anonymous

264+47-311 and 63+11=74 and 25+4=29

- briana.img

@DJthereal what? LOL

- anonymous

lol nvm

- anonymous

@LynFran where did 111 come from??

- anonymous

oh ok..so u take tha negative total and tha A total and divide them??

- briana.img

what's going on? lol

- anonymous

@LynFran jus figured it out i think

- briana.img

it's not one of the answers and i actually wanted to learn how to do it because i had another problem that's similar lol

- briana.img

@jim_thompson5910 help?

- anonymous

oh i think i get it tho

- anonymous

i can try to explain it if u need me to

- briana.img

@jim_thompson5910 help?

- briana.img

@DJthereal yes please but i don't think she got it right because those aren't one of the options

- anonymous

i kno but she did give me a big hint

- briana.img

aaaah okay so can you explain it please?

- anonymous

yea jus give me like 5 or 6 minutes

- jim_thompson5910

how many people have a blood type that is A-positive?

- briana.img

264

- jim_thompson5910

and how many people have Rh-negative blood?

- anonymous

yea i tried 111/264 and i thought that wood be tha answer

- briana.img

I don't exactly know what Rh means but 111?

- jim_thompson5910

neither do I, but luckily we don't need to know the biology behind the problem

- jim_thompson5910

so there are 264+111 = 375 people who have either A-positive or Rh-negative blood types

- jim_thompson5910

this is out of 740 people total (bottom right corner)
We then divide
P(A-positive OR Rh-negative) = (# of people who have A-positive or Rh-negative)/(# total)
P(A-positive OR Rh-negative) = (375)/(740)
P(A-positive OR Rh-negative) = 0.50675675675676
P(A-positive OR Rh-negative) = 0.507

- briana.img

Aaaaah okay thank you!! Makes much more sense now

- jim_thompson5910

I'm glad it's making more sense

- briana.img

Helped me understand my other problem as well! Thank you!!

- anonymous

@jim_thompson5910 good job i was getting confused

- briana.img

Could you guys help me with one more problem that I can't wrap my head around?

##### 1 Attachment

- briana.img

I think it's Rolling a 4 or rolling an odd number??? But I don't know it's confusing

- anonymous

wat does mutually exclusive mean??

- jim_thompson5910

if two events are `mutually exclusive`, then that means that they CANNOT happen at the same time
example: flipping a heads AND a tails on the same coin

- anonymous

oh ok

- anonymous

so it's not c because 5 is a prime number

- briana.img

Yeah I'm pretty sure it's D

- briana.img

Thanks guys!!

- jim_thompson5910

yep 4 is even, so it's impossible to roll an even AND odd number at the same time

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