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Mathematics 7 Online
OpenStudy (anonymous):

PLEASE HELP ME! THIS IS MY LIFE! I WILL GIVE U A MEDAL!

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 brown? Round to the nearest percent if necessary. six percent seven percent sixteen percent eighteen percent

OpenStudy (anonymous):

I am in between 6% 7% and 16%

OpenStudy (anonymous):

I don't know which one to pick?

OpenStudy (solomonzelman):

the P that he will choose brown at the first time is, (6 / [6+4+4] ) which equals, 6/14 and simplifies to 3/7 the P that he will choose brown at the first time is, (5 / [5+4+4] ) which equals, 5/13 The probability of 2 event happening at once is the product of the 2 probabilities.

OpenStudy (anonymous):

So.....

OpenStudy (solomonzelman):

If you have any questions about what I wrote, I will be happy to explain :)

OpenStudy (anonymous):

So which one would it be?

OpenStudy (solomonzelman):

product of 2 probabilities is when you multiply the 2 probabilities, (6/14) times (5/13)

OpenStudy (anonymous):

Ok Wait Let Me Solve That

OpenStudy (solomonzelman):

find the fraction and put it (approximately) in terms of percent go ahead.....

OpenStudy (anonymous):

0.16483516483

OpenStudy (anonymous):

@SolomonZelman I solved it :)

OpenStudy (anonymous):

But know what is the answer?

OpenStudy (anonymous):

So the answer is 16% right?

OpenStudy (anonymous):

???????? Is it 16%?

OpenStudy (solomonzelman):

yes, you are indeed correct!

OpenStudy (anonymous):

YAY! THANKS!

OpenStudy (solomonzelman):

You welcome !

OpenStudy (anonymous):

Thank you so much can u help me with another question?

OpenStudy (anonymous):

@SolomonZelman can you help me with another one?

OpenStudy (solomonzelman):

Yes, I can try at least :)

OpenStudy (anonymous):

Ok thanks :)

OpenStudy (anonymous):

OpenStudy (anonymous):

@SolomonZelman please come help! :)

OpenStudy (anonymous):

@SolomonZelman & @sleepyjess can you please come help... Thank you :)

OpenStudy (solomonzelman):

okay, can you calculate the number of people in the class first ?

OpenStudy (anonymous):

What do you mean?

OpenStudy (anonymous):

@SolomonZelman help i don't get it!

OpenStudy (solomonzelman):

How many people sold between 0 and 9 ? How many people sold between 10 and 19 ? How many people sold between 20 and 29 ? How many people sold between 30 and 39 ? How many people sold between 40 and 49 ? answer each question for me please.

OpenStudy (anonymous):

so i have to subtract?

OpenStudy (anonymous):

@SolomonZelman do i have to subtract?

OpenStudy (solomonzelman):

Subtract what ? just answer each of the 5 questions I have posted at first.

OpenStudy (anonymous):

??

OpenStudy (anonymous):

ohhh

OpenStudy (anonymous):

i get it

OpenStudy (solomonzelman):

1) How many people sold between 0 and 9 ? 2) How many people sold between 10 and 19 ? 3) How many people sold between 20 and 29 ? 4) How many people sold between 30 and 39 ? 5) How many people sold between 40 and 49 ? answer each question for me please.

OpenStudy (anonymous):

0-9= 2

OpenStudy (anonymous):

10-19 = 5

OpenStudy (anonymous):

20-29= 8

OpenStudy (anonymous):

30-39= 3

OpenStudy (anonymous):

40-49 =4

OpenStudy (anonymous):

ok i finish!

OpenStudy (solomonzelman):

yes, correct.

OpenStudy (anonymous):

:)

OpenStudy (solomonzelman):

So how many people are there in the entire class ?

OpenStudy (anonymous):

22 :)

OpenStudy (solomonzelman):

yes.

OpenStudy (anonymous):

....

OpenStudy (solomonzelman):

how many people in the class sold less than 20 hoagies ?

OpenStudy (anonymous):

i don't get it :( sorry

OpenStudy (solomonzelman):

how many people sold btw 0-9? and how many people sold btw 10-19? 2 and 5 both of these, btw 0-9 and btw 10-19 sold LESS THAN 20, So, 7 people in the class sold less than 20 hoagies.

OpenStudy (anonymous):

0-9

OpenStudy (anonymous):

so 20 would be the answer for the first one?

OpenStudy (solomonzelman):

Well, A) asks for the percent of the people in class that sold less than 20. You know that 7 people in class (out of the 22 people class) sold less than 20. So 7/20 would be the fraction and percent wise, 35. Looks like B is the closest, even though still far from the truth.

OpenStudy (anonymous):

B?

OpenStudy (solomonzelman):

yes for the first row second column, it is B.

OpenStudy (solomonzelman):

I mean to fill in B into 1st row , 1st column

OpenStudy (anonymous):

Ok

OpenStudy (anonymous):

Okw aht about the second one

OpenStudy (solomonzelman):

lets do the question that asks what is the greatest number of hoagies that could have been sold by 1 student. What do you think, which one is it ?

OpenStudy (anonymous):

ok um...

OpenStudy (anonymous):

49

OpenStudy (solomonzelman):

Yes, you are correct !

OpenStudy (anonymous):

are u sure?

OpenStudy (anonymous):

just cuz it;s the big number?

OpenStudy (solomonzelman):

yes, I am sure ! Now, do the question that says "what is the total number of students in the class which one do you think is it ?

OpenStudy (anonymous):

so the second column is d

OpenStudy (solomonzelman):

first column, B second column D is what we got so far. can you do the third column ?

OpenStudy (anonymous):

22!

OpenStudy (solomonzelman):

Yes, so first column, B second column D third column, C I don't think you need me for the forth column.

OpenStudy (anonymous):

YAY! :)|dw:1399423846642:dw|

OpenStudy (anonymous):

Nope but wait!

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