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ICE Princess25 [194]
3 years ago
14

The probability of picking two black marbles from a box at random without replacement is 1091 . The probability of drawing a bla

ck marble first is 514 . What is the probability of picking a second black marble, given that the first marble picked was black?
Mathematics
2 answers:
Nana76 [90]3 years ago
5 0
<u><em /></u><em />The correct answer to the question above is 4/13. Below it shows how it's achieved...<u><em>

EQUATION:</em></u>
 
P(A|B) = <u>P(A ∩ B)
</u>                 P(B)
<u>
</u>Step 1: Identify 
P(B) = 5/14 
P(A ∩ B) = 10/91
<u>
</u>Step 2: Insert into the equation and Solve
10/91 ÷ 5/14
Use reciprocal to divide
10/91 × 14/5 
Simplify the answer 
140/455
Simplified (Final Answer)
4/13 


<u>
</u>
<u>

</u>
EastWind [94]3 years ago
4 0

Answer:

4/13

<em>This is the correct answer! I just took the test! Good luck!!</em>

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<u>Answer:</u>

The given statement is False statement

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3 years ago
Which shows the correct substitution of the values a, b, and c from the equation 1 = -2x + 3x2 + 1 into the quadratic
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Answer: A

Step-by-step explanation:

The first thing we need to do is to make sure our equation is in standard form. The given equation is not in standard form.

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Now that the equation is in standard form, we can find our A, B, C to see which quadratic equation is correct.

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We can automatically eliminate D because the first value is -3 when it is supposed to be -(-2). Also, the denominator is supposed to be 2a. We know that A=3. The denominator should be 2(3), not 2(-2).

Next, we can eliminate B and C. For the 4ac, we know it has to be 4(3)(0) because A=3 and C=0. B and C have given 4(3)(2) and 4(3)(1), respectively. This does not match A=3 and C=0.

Therefore, A is the correct answer.

4 0
3 years ago
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Can someone help me on my last problem? #10
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