Question

Find P(not a 3)

x 1 2 3 4
P(x) 0.30 0.40 0.15 0.15

i dont understand this question. please help

Answer 1

P(not a 3) =p(1) + p(2) + p(4) = 1- p(3)

Just substitute values.

Answer 2

so that means ?

Answer 3

sorry im not good at this!

Answer 4

That means that you have study harder! :)

Answer 5

lol i already know that lol

Answer 6

Then why not following it! ;)

Answer 7

ifyour not going to help dont insult me lol.

Answer 8

at lease help me find the answer then insult me. lol

Answer 9

Well leme try to help.

So can you tell me value of P(1) from the table ?

Answer 10

0.30

Answer 11

okay, so you know all p(1), p(2),p(3),p(4) right ?

Answer 12

yes

Answer 13

peter. thank you for helping me on my last problem!

Answer 14

Now, p(3) means we get a 3,
p(not 3) would mean we get a number which is not 3

Answer 15

if not 3, then we can get 1,2 or 4.

So our final asnwer would be p(1) + p(2) + p(4)

Answer 16

add them all up and that should be my answer?

Answer 17

Yes

there is an alternative way also, in case you know that sum of all probabilities = 1 ?

Answer 18

they do

Answer 19

So p(not 3) would mean we get any number else, so answer would be 1-p(3)

this is the same as p(1) + p(2) + p(4)

Answer 20

answer was 0.85

Answer 21

Thats correct