Question

Bozo the
clown
brings a total of 20 balloons to Jake
’
s birthday party.
There are
7
yellow, 2 red
, and
1
1
green
balloons
. He
reaches
into his pocket and
randomly selects a color to make a balloon animal. If
he
pulls
a yellow
balloon
first, what is the probability of the next color to be selected randomly
will
also be yellow?

Answer 1

@TuringTest

Answer 2

@Michele_Laino

Answer 3

First, add up all the numbers. What do you get?

Answer 4

no you dont add all the numbers togehter

Answer 5

Yeah and then put how much yellow over i9t for a fraction.

Answer 6

but they took one yellow from there

Answer 7

well the answer is how many yellow balloons minus one yellow balloon equals blank over total amount then see if there is a common number to be divided by

Answer 8

so its 6 yellow

Answer 9

by the total amount i mean how many balloons he has all together. yes he has 6 yellow and it is over 20 so divide both by 2 and you get ur answer

Answer 10

Hint: the yellow balloons, after the first selection, are 6, so the total balloon are 20-1=19. Now the requested probability is equal to the ratio:
favorable cases/ possible cases

Answer 11

long problem short u get 3/10

Answer 12

so it would be 6/19 @Michele_Laino

Answer 13

that's right!

Answer 14

ok so i divide that

Answer 15

@Michele_Laino

Answer 16

I think that it is not necessary, namely p=6/19 is a good answer

Answer 17

wait what that cant be the answer 6/19

Answer 18

yeah it can. Probability can be a fraction.

Answer 19

furthermore, note that, the total probability, namely the probability to get two yellow balloons, at the first two selections, is equal to the product of the single probabilities, namely:
total probability = (7/20)*(6/19)=...?

Answer 20

so what is the answer?

Answer 21

the answer is:
the probability of the second selection, is 6/19
whereas the total probability to get two yellow balloons consecutively, namely after two selections, is given by the subsequent product:
(7/20)*(6/19)

Answer 22

in general the probability is expressed as a ratio, or fraction

Answer 23

so, the first probability, is 6/19,
whereas the second probability or total probability, is:
(7/20)*(6/19)=42/380=21/190