1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
umka2103 [35]
3 years ago
12

Two balls are to be pulled from a vase that contains 7 red balls 9 green balls and 2 black balls. After the first ball Is drawn,

it is not the replaced. What is the probability that two black balls are chosen from the vase?
Mathematics
1 answer:
Vladimir79 [104]3 years ago
5 0

Answer:

\frac{1}{153}

Step-by-step explanation:

There are a total of 7 + 9 + 2 = 18 balls in the vase, therefore, when not replacing the first ball, there would be 18 · 17 = 306 ways to pull 2 balls. There are 2 ways to choose the first black ball and then 1 way to choose the second black ball so there are 2 · 1 = 2 ways to choose 2 black balls. Therefore, the probability is 2 / 306 = \frac{1}{153}.

You might be interested in
A study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain sca
blondinia [14]

The confidence interval for mean of the "before-after" differences is \fbox{(-0.4037,1.8037)}

Further explanation:

Find the difference between the before pain and the after pain.

Difference = before-after

Kindly refer to the Table for the difference of between the before and after pain.

Sum of difference = 5.6

Total number of observation = 8

Mean of difference = 0.7

Sample standard deviation s = 1.3201

Level of significance = 5\%

Formula for confidence interval = \left( \bar{X} \pm t_{n-1, \frac{\alpha}{2}\%} \frac{s}{\sqrt{n}} \right)

confidence interval = \left( 0.7 \pm t_{8-1, \frac{5}{2}\%} \frac{1.3201}{\sqrt{8}} \right)

confidence interval = \left( 0.7 \pm t_{7, \frac{5}{2}\%} \frac{1.3201}{\sqrt{8}} \right)

From the t-table.

The value of t_{7, \frac{5}{2}\%=2.365

Confidence interval = ( 0.7 \pm 2.365}\times \frac{1.3201}{\sqrt{8}}) \right)

Confidence interval = \left( 0.7 - 2.365}\times \0.4667,0.7 + 2.365}\times \0.4667) \right

Confidence interval = (0.7-1.1037,0.7+1.1037)

Confidence interval = \fbox{(-0.4037,1.8037)}

The 95\% confidence interval tells us about that 95\% chances of the true mean or population mean lies in the interval.

Yes, the hypnotism appear to be effective in reducing pain as confidence interval include includes the positive deviation from the mean.

Learn More:

1. Learn more about equation of circle brainly.com/question/1506955

2. Learn more about line segments brainly.com/question/909890  

Answer Details:

Grade: College Statistics

Subject: Mathematics

Chapter: Confidence Interval

Keywords:

Probability, Statistics, Speed dating, Females rating, Confidence interval, t-test, Level of significance , Normal distribution, Central Limit Theorem, t-table, Population mean, Sample mean, Standard deviation, Symmetric, Variance.

7 0
3 years ago
Read 2 more answers
Put 9, -7, and -8 in order from least to greatest. You can use the number line to help. 9 -10 -8 -7 -6 -8 -4 -2 0 2 4 6 8 10​
boyakko [2]

-8, -7, 9

Step-by-step explanation:

8 0
1 year ago
7 students have 5 blocks each. Which helps you find the total number of blocks? 7 - 5 7 ÷ 5 7 × 5 7 + 5
Ber [7]

Answer:

7 X 5

You use multiplacation to find the total number of blocks

7 0
3 years ago
What number can go into 26 and 10?
lesya [120]
10...................
6 0
3 years ago
Read 2 more answers
What are the amplitude, period, and midline of f(x) = 5 sin(x − π) + 3?
Semmy [17]

Answer:

amplitude: 5; period: 2π; midline: y = 3

Step-by-step explanation:

7 0
3 years ago
Other questions:
  • Will award brainliest!
    14·2 answers
  • If (54)m = 512, what is the value of m? 2 3 5 8
    6·2 answers
  • Pls help!!!!!!!!!!!!!!!
    9·2 answers
  • The stem-and-leaf plot shows the scores of a class of sixth graders on a math test.
    9·1 answer
  • MANY POINTS
    7·1 answer
  • Can you help me with the first one
    14·1 answer
  • What is the measure of the exterior angle?
    8·1 answer
  • Help I will give brainiest​
    7·2 answers
  • Two cars started moving in opposite
    6·1 answer
  • What is the shortest possible perimeter for an arrangement with an area of 15 square feet
    10·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!