Question

please someone help me ! math is getting on my nerves !! Will become fan, write testimony, and give medal :) please help im begging you :(

Answer 1

A bag contains 4 white, 3 blue, and 5 red marbles.
#1. Find the probability of choosing a red marble, then a white marble if the marbles are replaced.
A: 1/12 B:5/36 C:5/6 D:5/12
#2. Find the probability of choosing 3 blue marbles in a row if the marbles are replaced.
A:2/11 B:1/222 C:1/27 D:1/64
#3. Find the probability of choosing a blue marble then a red marble if the marbles are not replaced.
A:5/44 B:15/35 C:2/3 D:1/15
#4. Find the probability of choosing 2 white marblesin a row if they are not replaced.
A: 1/11 B:1/9 C:2/3 D: 1/16

Answer 2

http://openstudy.com/study#/updates/531101ffe4b0cecd2345cd9b

Answer 3

How many marbles are in the bag total?

Answer 4

12

Answer 5

good so now what is the probablility of just picking a red marble?

Answer 6

1/12?

Answer 7

is there only one red marble in the bag?

Answer 8

no 4 so 1/4 ? 4/12?

Answer 9

how many red marbles are in the bag?

Answer 10

4.

Answer 11

oops 5 sorry

Answer 12

so our probability is?

Answer 13

5/12

Answer 14

right so that is your first pull for part a, correct now, you are going to have how many marbles in the bag?

Answer 15

12. this is for number two right

Answer 16

no still 1

Answer 17

oh okay :)

Answer 18

so now if we put our first marble back, how many are in the bag?

Answer 19

12

Answer 20

ggod now what is the prb of getting a white ball?

Answer 21

4/12

Answer 22

so now we need to simplify that, what do we get?

Answer 23

2/6

Answer 24

and simplify again

Answer 25

1/3

Answer 26

good so now, we have a 5/12 prob for the first event and a 1/3 for the second. The probability of those happening successively is the product of the prob. so what is the answer to #1

Answer 27

so we add those two together?

Answer 28

what does product mean?

Answer 29

add

Answer 30

no that is sum

Answer 31

okay....multiplication.. sorry

Answer 32

yup yup, don't be sorry. Mistakes are how you learn

Answer 33

:) okay give me a moment

Answer 34

okee dokey

Answer 35

5/36?

Answer 36

yup yup

Answer 37

so now #2, is similar

Answer 38

now, why don't you try it on your own first?

Answer 39

okay :)so we have 3 blue marbles. wouldnt our denominator be 12 ?

Answer 40

mhmm, why?

Answer 41

Well cause on my answer choices it has 11,222,27,64 for our denominator opptions

Answer 42

no, remember before what was on the bottom and why? re read above

Answer 43

12 was on the bottom because their was 12 marbles all together

Answer 44

right, so that is the reason here too

Answer 45

okay. so we would have 3/12 3 brlu marbles and 12 marbles all together

Answer 46

i dont really know what to do from there...:(

Answer 47

so, what is the probability the second pull after you put the first marble back?

Answer 48

huh ?

Answer 49

what is the prob that you'll pull a blue marble?

Answer 50

the second time? Is it the same as the first?