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Oxana [17]
4 years ago
15

Ajar contains "x" black and "y" white balls. What is the probability that a random draw is black?

Mathematics
2 answers:
Levart [38]4 years ago
8 0

Answer:

Step-by-step explanation:

favorable events=x

total number of events=x+y

P=(favorable events)/(total number of events)=x/(x+y)

lubasha [3.4K]4 years ago
6 0
If there are ‘x’ black balls and ‘y’ white balls, then the total number in the jar must be x + y.
Therefore, the probability of picking a black ball is the amount of black balls there are divided by the total, which is x/(x+y)

I hope this helps!
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Naya [18.7K]

Using the z-distribution, it is found that the lower bound of the 99% confidence interval is given by:

d. 68.39%.

<h3>What is a confidence interval of proportions?</h3>

A confidence interval of proportions is given by:

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which:

  • \pi is the sample proportion.
  • z is the critical value.
  • n is the sample size.

In this problem, we have a 99% confidence level, hence\alpha = 0.99, z is the value of Z that has a p-value of \frac{1+0.99}{2} = 0.995, so the critical value is z = 2.575.

The sample size and estimate are given by:

n = 2002, \pi = 0.71

Hence, the lower bound is given by:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.71 - 2.575\sqrt{\frac{0.71(0.29)}{2002}} = 0.6839

Hence the lower bound is of 68.39%, which means that option D is correct.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

4 0
3 years ago
Please help if you can :)
galben [10]

Answer:

In the pictures linked.

Step-by-step explanation:

The pictures I linked have the answers. Brainly wouldn't let me submit it because I apparently used bad words.

7 0
3 years ago
Please help with solving the blank answers
KATRIN_1 [288]
Distribute The 4 In Problem Number 2. (4*2.5X)+(4*1.25) = 77
Simplify. 10X+5 = 77. Now, Subtract 5 From Both Sides. 
10X = 77-5
10X = 72.
Now, Divide.
X = 72/10. 
X = 7.2.
For 13, We Have This:
3/5p+2/3 = 8.
Now, Subtract 2/3. 
3/5p = 7 1/3
Now, Divide. 
7 1/3 Needs To Be Converted To An Improper Fraction. 
It Becomes 22/3.
22    5    110
--- * --- = ----
 3     3      9
Now, Make Into A Proper Fraction.
It Becomes 12 And 2/9. 

6 0
3 years ago
Evaluate the exponential expression.<br> 3•42
LuckyWell [14K]

Answer:

48

Step-by-step explanation:

Trust me

8 0
3 years ago
20 Points!!! Math Question
larisa86 [58]

Here is how to do the question,

The Remainder Theorem starts with an unnamed polynomial p(x), where "p(x)" just means "some polynomial p whose variable is x". ... If you get a remainder, you do the multiplication and then add the remainder back in. For instance, since 13 ÷ 5 = 2 R 3, then 13 = 5 × 2 + 3. This process works the same way with polynomials.

Hope that helps!!!!

3 0
3 years ago
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