(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

- anonymous

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- anonymous

can anybody help?

- welshfella

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

- welshfella

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

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## More answers

- anonymous

but thats not one of the answers

- welshfella

work it out

- anonymous

all it gives me is:
25
40
100
250

- welshfella

multiply 400 by 5
then divide by 8

- anonymous

the answers 200?

- welshfella

no

- welshfella

its just calculator work

- anonymous

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

- welshfella

yw

- anonymous

can you help me with another one

- welshfella

ok

- anonymous

(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

- anonymous

sorry it took me a while t o type out lol

- welshfella

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

- anonymous

ok?

- anonymous

what does that mean lol

- welshfella

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

- anonymous

oh A

- anonymous

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

- welshfella

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

- anonymous

so A?

- welshfella

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

- anonymous

im so confused

- welshfella

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

- anonymous

50%

- welshfella

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

- anonymous

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

- welshfella

experimental probability = 13/20
theoretical probability = 1/2
so now you can pick the correct option

- welshfella

- which is the largest?

- anonymous

epirement

- welshfella

correct Now you have it.

- anonymous

thanks again

- welshfella

yw

- anonymous

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

- anonymous

im really stupid xD

- welshfella

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

- welshfella

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

- anonymous

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

- anonymous

and oh ok

- anonymous

yeah i understand it better now

- welshfella

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

- anonymous

ok but thanks for the previus help!

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