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FromTheMoon [43]
3 years ago
13

Suppose a bag contains 4 white chips and 6 black chips. What is the probability of randomly choosing a white chip, not replacing

it, and then randomly choosing another white chip? A.9/25 B.2/15 C.4/25 D.1/3
Mathematics
2 answers:
Marysya12 [62]3 years ago
5 0
There are 10 chips altogether. 4 of them are white.
4/10 is the chance of lifting out a white chip
There are 3 of them left and 9 chips altogehter.
4/10 * 3/9
12/90
4/30
2/15

Comment
(my edit) it is not that 2/15 is wrong (although it is not entirely right).
1/3 is the correct answer if you assume that what happened during the first draw has nothing to do with what will happen on the second. It is like saying if you throw 11 heads in a row with a fair coin, what are the chances of throwing a heads on the 12th throw? The answer is 1/2. That is the same kind of question you have asked.

The two of us who have responded have really responded to what are the chances of drawing 2 white chips. The question really does not restrict us in a way that prevents us from saying that. I'll stick with
B <<<< answer
but I think it would be nice if the writer of the question made it clear that 1/3 should be the proper answer. I am glad you came back and posted the right answer. It makes me think. 

The semi right answer is B <<<<---- 

If my reasoning bothers anybody, I'll reedit again. I'm only leaving it because sometimes a mistake is more instructive than a given answer.
Allisa [31]3 years ago
3 0
Answer is 2/15

There are initially <span>4+6=10</span> chips in the bag, so the probability of the first chip drawn being white is:

<span><span>4/10</span>=<span>2/5</span></span>

Having drawn a white chip there are then 3 white chips left in the bag out of a total <span>3+6=9</span> chips. So the probability of the second chip also being white is:

<span><span>3/9</span>=<span>1/3</span></span>

So the probability of drawing two white chips is:

<span><span>2/5x</span><span>1/3</span>=<span><span>2/15</span></span></span>

Pls mark brainliest

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Hope this helped!

4 0
3 years ago
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viva [34]

Answer:

A.

5

8

−

3

8

=

2

0

B.

5

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−

3

8

=

2

8

C.

5

8

+

3

8

=

8

8

D.

5

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3

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16

Step-by-step explanation:

4 0
2 years ago
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gladu [14]

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Step-by-step explanation:

5 0
3 years ago
Read 2 more answers
If two sweaters and four shirts cost $150, and four sweaters and three shirts cost $200, find the price of each shirt and each s
STALIN [3.7K]

Answer:

shirt = $20

sweater = $35

Step-by-step explanation:

This question would be solved using simultaneous equation

Let the price of sweater be represented by a

Let the price of shirt be represented by b

The following equations can be derived from the question

2a + 4b = 150   equation 1

4a + 3b = 200   equation 2

Multiply equation 1 by 2

4a + 8b = 300    equation 3

Subtract equation 2 from 3

5b = 100

divide both sides of the equation by 5

b = 20

substitute for b in equation 1

2a + 4(20) = 150

2a + 80 = 150

collect like terms

2a = 150 - 80

2a = 70

divide both sides by 2

a = 35

Price of sweater = $35

Price of shirt = $20

4 0
2 years ago
Read 2 more answers
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