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Mathematics 20 Online
OpenStudy (anonymous):

Henry grabs one shoe at a time at random without replacement from a box of fourteen shoes in his closet. The box contains 6 brown shoes, 4 black shoes, and 4 sneakers. What is the probability that the first two shoes he chooses will be black? Round to the nearest percent if necessary. 7% 8% 16% 18%

OpenStudy (anonymous_user):

16%

OpenStudy (anonymous):

explain plese

OpenStudy (anonymous):

It'd be 7%. This is because the first time, it's a 4 in 14 chance. Second time, since one shoe is gone from both the overall and black shoe categories, it's a 3 in 13 chance. (4/14)*(3/13).

OpenStudy (anonymous):

thanks both of u

OpenStudy (anonymous):

Which one of us is correct? I think I'm right, but you can never be too sure.

OpenStudy (anonymous):

ya ur right?

OpenStudy (anonymous):

@ganeshie8

OpenStudy (mathstudent55):

@Shaunticlair Great job! You are correct, and good explanation.

OpenStudy (anonymous):

Which of the following is not a true general statement? A biased sample can result in a representative conclusion. Stratified sampling results in a biased sample. A smaller sample is more representative of the population. A systematic sampling method is an effective method for scientific research.

OpenStudy (anonymous):

First and third.

OpenStudy (anonymous):

it can only be 1?

OpenStudy (anonymous):

Oops, misread number one.

OpenStudy (anonymous):

It's only three: a smaller sample is not more representative of the population.

OpenStudy (anonymous):

?

OpenStudy (anonymous):

I'm saying that number three is the untrue one, and then I stated why.

OpenStudy (anonymous):

ok?

OpenStudy (anonymous):

Did I word something improperly?

OpenStudy (anonymous):

u mean wrote

OpenStudy (anonymous):

To word something is still a valid verb to use there, but that's aside from the point. What did I say that confused you?

OpenStudy (anonymous):

nothing

OpenStudy (anonymous):

Oh, alright.

OpenStudy (anonymous):

wait wuts the answere and how

OpenStudy (anonymous):

The answer is the third statement:It says a smaller sample is more representative of the population, which is untrue.

OpenStudy (anonymous):

ow ok now i get it thanks

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