Question

@agent0smith

Answer 1

.10/.20?

Answer 2

'Or' means

P(A or B) = P(A) + P(B) - P(A and B)

Answer 3

The probabilities are already given. Just sum up all the cases where it's red or no smile

Answer 4

wait but this one says "and" why do they use that formula.

Answer 5

They made some mistakes with the symbols

Answer 6

wdym

Answer 7

http://image.slidesharecdn.com/fsmkalimbangkonvensyenmatematiktambahan2007probabilityprobability-f5-100619041442-phpapp02/95/probability-6-728.jpg?cb=1276921833

Answer 8

ohhh nvm its correct

Answer 9

Their work was right but some wrong symbols

Answer 10

show me what is wrong some are supposed to be U?

Answer 11

See the pic above

Answer 12

or https://upload.wikimedia.org/math/8/4/5/845ddb87f1592b81a16fed56c78323bf.png

Answer 13

so like that?? since its not mutually exclusive

Answer 14

Exactly

Answer 15

okay.

p(a)=.10
p(b)=.20

Answer 16

No...

No smile is an entire row. Red is a column.

Answer 17

A=.30
B=.5

Answer 18

And you need P(A and B)

Answer 19

how do i find that??

Answer 20

in the table... P(red and no smile)

Answer 21

0.20

Answer 22

0.30+0.50-0.20=0.60

Answer 23

so its A, correct?

Answer 24

yes, 0.6