Question

HELP WILL GIVE MEDALS!!! A bag of candy contains 3 blue, 5 red, 4 green, and 3 brown pieces.

Answer 1

what are you, 5? this is easy

Answer 2

a. What is the probability of picking a blue and then a green, with replacement?
b. What is the probability of picking a blue and then a green, without replacement?
c. The probability of choosing a blue, putting it back and picking another candy is 1/15. What was the second color picked?
d. You have a new bag of 20 pieces of candy with the same colors of candy, just different amounts. You know there are 5 reds. You pick a red, don't put it back and then pick a green. The probability of this happening is 5/38. How many greens are there?

Answer 3

actual question^

Answer 4

lol

Answer 5

its algebra ll

Answer 6

probability of picking a green = number of green pieces
----------------------
total number of pieces in the box

Answer 7

for a blue its number of blue on top of fraction

Answer 8

now for a blue and then a green you multiply the probabilities
because both events are independent

Answer 9

i this is the info for question a

Answer 10

so and means multiply and or means add?

Answer 11

yes

Answer 12

ok

Answer 13

P (green) = 3/15 right?

Answer 14

its 4

Answer 15

- did you spot my deliberate mistake??

Answer 16

you did! lol

Answer 17

yeah green is 4/15 not 3/15

Answer 18

lol now so if its 3/15 , 4/14 i would multiply both denom and numerator

Answer 19

yea - I made a mistake - it wasnt deliberate...

Answer 20

but if it denominator is the same do i still multiply them

Answer 21

4/15 not 4/14

ytes you multiply 3/15 * 4/15

or easier 1/5 * 4/15

Answer 22

yes - its multiplication not addition

Answer 23

well A says with replacement and B says without so A it would be 4/14 wouldnt it or is it B for 4/14

Answer 24

Oh yes - i thought we were still talking about A

Answer 25

wait so its B that turns into 4/14

Answer 26

4/14 for B

Answer 27

lol ok

Answer 28

now for C the wording is confusing for me

Answer 29

yes - first you pick out a blue put it back and then pick another candy but they dont tell you which one so you can call the second candy x and form an equation

Answer 30

so (1/5) x = (1/15)

Answer 31

ok so d would just be 3

Answer 32

yeah i got that thanks

Answer 33

so what would c be?

Answer 34

i put that exact formula lol

Answer 35

from the equation x = 1/15 / 1/5 = 1/15 * 5 = 1/3

Answer 36

- so you need to find the candy whose probability of being picked is 1/3

Answer 37

ok

Answer 38

to make it easier write 1/3 as 5/15

Answer 39

so would it be red

Answer 40

right!!

Answer 41

wait i think im wrong

Answer 42

oh damn lol

Answer 43

it looked wrong for a sec

Answer 44

no - there are 5 reds Red is correct

Answer 45

but yeah so d, i would its 3

Answer 46

oh damn never mind.

Answer 47

oh damn idk. them words

Answer 48

hhmm

P (Red) = 5/20 = 1/4

so (1/4) * x = 5/38

Answer 49

multiply 4 by 1/4 ?

Answer 50

its easier to write this as follows then cross multiply