Question

Plz Help. Will give medal and fan.
Suppose you have a wallet with $5 bills, $10 bills, and $20 bills. If the probability of picking a $20 bill is 4/15, and the probability of picking a $20 bill is 4/15, and the probability of picking a $5 bill is 1/3, what is the probability of picking a $20 bill?

Answer 1

Choices are-
1/15
1/5
4/15
2/5

Answer 2

It gives you " If the probability of picking a $20 bill is 4/15...and the probability of picking a $20 bill is 4/15"

then it asks "what is the probability of picking a $20 bill?"

Something seems wrong here. It seems like this is a trick question.

Answer 3

I know. And I'm not good at Probability... Can you help me?

Answer 4

No explained it wrong

Answer 5

It literally tells you the probability of picking a $20

Answer 6

which is why I'm thinking something is off here

Answer 7

Suppose you have a wallet with $5 bills, $10 bills, and $20 bills. If the probability of picking a $10 bill is 4/15, and the probability of picking a $5 bill is 1/3, what is the probability of picking a $20 bill?
Sorry that's the right question

Answer 8

oh ok

Answer 9

what do you get when you add 4/15 and 1/3 ?

Answer 10

3/5

Answer 11

so the probability of picking a $5 or a $10 is 3/5

let x = probability of picking a $20

-------------------------------------------------------

(probability of picking a $5 or $10) + (probability of picking a $20) = 100%

3/5 + x = 1

solve for x to get x = ???

Answer 12

2/5?

Answer 13

correct

Answer 14

So the answer is 2/5?

Answer 15

Thank you

Answer 16

yes

Answer 17

np