Question

(06.02)A bag contains 40 marbles, 4 of which are blue, 10 are red, 25 are green, and 1 is purple. Shawna takes a marble out of the bag, records the color, and returns it to the bag. How many green marbles should she expect after 400 trials?
25
40
100
250

Answer 1

can anybody help?

Answer 2

there are 25 green marbles out of a total of 40
so the property of picking a green marble is 25/40 = 5/8

Answer 3

so the expected number in 400 tyrials is 400 * 5/8

Answer 4

but thats not one of the answers

Answer 5

work it out

Answer 6

all it gives me is:
25
40
100
250

Answer 7

multiply 400 by 5
then divide by 8

Answer 8

the answers 200?

Answer 9

no

Answer 10

its just calculator work

Answer 11

oh its 250
i was trying to do it in my head lol
thank you so much :)

Answer 12

yw

Answer 13

can you help me with another one

Answer 14

ok

Answer 15

(06.02)A six-sided number cube labeled 1 through 6 is rolled 500 times. An odd number is rolled 325 times. Compare the experimental probability of rolling an odd number with the theoretical probability of rolling an odd number and select one of the statements below that best describes the situation.
The experimental probability and theoretical probability are the same
The experimental probability is larger than the theoretical probability
The experimental probability is smaller than the theoretical probability
There is not enough information to determine the relative frequency

Answer 16

sorry it took me a while t o type out lol

Answer 17

the experimental P of rolling odd = 325/500 = 13/20

Answer 18

ok?

Answer 19

what does that mean lol

Answer 20

now what do you think the theoretical probability of getting an odd number is?
Note there are an equal number of odd and even numbers on the cube

Answer 21

oh A

Answer 22

thats what i got before lol but i thought it was wrong xD

Answer 23

the experimental probability is the result of experimenting - the 500 rolls of the cube.

Answer 24

so A?

Answer 25

no they are not the same
the theoretical is what you might expect to get - due to the fact that there are an equal number of odd and even numbers

Answer 26

im so confused

Answer 27

on a coin you have 2 things heads or tails - what is Probability of getting a head?

Answer 28

50%

Answer 29

yes or as a fraction its 1/2
- well its same for odd numbers on a dice - 2 possiblities odd or even

Answer 30

can you give me the answer lol i dont get any of this

Answer 31

experimental probability = 13/20
theoretical probability = 1/2

so now you can pick the correct option

Answer 32

- which is the largest?

Answer 33

epirement

Answer 34

correct Now you have it.

Answer 35

thanks again

Answer 36

yw

Answer 37

i wish you could help me with my whole test lol T^T

Answer 38

im really stupid xD

Answer 39

we are here to help you understand
read over the posts and try to understand why we have done what we've done.

Answer 40

you understand the coin part so you should understand the cube part
you have 6 numbers on a cube
135 and 246 - that is 2 lots - one odd and one even
so P(even) = 3/6 = 1/2 and
P(odd) = 3/6 = 1/2 also

Answer 41

but could you help me with the rest of the test, sorry to ask but i have 13 more mintues until my times up and then i wont be able to enter the tests again so im trying to rush

Answer 42

and oh ok

Answer 43

yeah i understand it better now

Answer 44

no i haven't got the time for that . And thats not what openstudy is about

Answer 45

ok but thanks for the previus help!