Question

The probability that an event will happen is . What is the probability that the event will not happen?
0
3/8
5/8

Answer 1

@satellite73

Answer 2

@dan815

Answer 3

@LyricalDevonne

Answer 4

@eliasperez191

Answer 5

@skullpatrol

Answer 6

@ganeshie8

Answer 7

please limit to one question per post

Answer 8

@ganeshie8 OK i'll be sure to do that next time. I'm sorry. Are you still willing to help me?

Answer 9

which question ?

Answer 10

The first one. I don't know to find the probability that an event won't happen.

Answer 11

I think there was something missing in the question.. looks there was some probolem with pasting..

Answer 12

The probability that an event will happen is ` `. What is the probability that the event will not happen?

Answer 13

i feel something is missing at that blank ` `

Answer 14

It's 5/8. Sorry @ganeshie8

Answer 15

Okay, use below :

P(not A) = 1 - P(A)

Answer 16

`probability that an event does not happen`= 1 - `probability that the happen happens`

Answer 17

Am I able to figure out the equation off of that? I'm still confused.

Answer 18

you're given P(A) = 5/8

Answer 19

simply subtract it from 1 fro P(not A)

Answer 20

P(not A) = 1 - 5/8

Answer 21

So 5/8-1=3/8

Answer 22

Yep!

Answer 23

How come we subtract from one instead of any other number @ganeshie8

Answer 24

thats a very good question!

Answer 25

probability is a number between 0 and 1

Answer 26

and all the probabilities of outcomes add up to 1

Answer 27

since an even can either "happen" or "not happen", the sum of these probabilities will be 1 :

P(A) + P(not A) = 1

Answer 28

OK I feel like I have a better grasp on probability than I did before. Thanks! :)

Answer 29

no, i think im confusing u :) let me give u an example

you will always win if you bet something like this :
today it either rains or it doesnt rain

Answer 30

are there any other possibilities for it ?
it either rains, or it doesnt rain.

so P(rains today) + P(does not rain today) = 1