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
oksian1 [2.3K]
3 years ago
12

An urn contains 12 balls, five of which are red. Selection of a red ball is desired and is therefore considered to be a success.

If three balls are selected, what is the expected value of the distribution of the number of selected red balls
Mathematics
2 answers:
SVEN [57.7K]3 years ago
8 0

Answer:

2/10

Step-by-step explanation:

sp2606 [1]3 years ago
4 0
Assume there are equal amount of a lot of red and other color balls in the urn for you to select r=red and o=other, all the possible outcome for selecting 3 in sequence is 1r2r3r, 1r2r3o,1r2o3r, 1o2r3r, 1r2o3o, 1o2r3o, 1o2o3r, 1o2o3o. In terms of expected value, 1 case for all 3 reds, 3 cases for 2 reds, 3 cases for 1 red, and 1 case for 0 red. Equal large amount of red and other means all 8 outcomes has equal possibilities so each is 1/8 and 3 reds will have possibility of 1/8, 2 reds will have 3/8, 1 red will have 3/8 and no red will have 1/8. However the question tells you the red and other don’t have equal amounts, 5/12 possibility for each pick for red and 7/12 possibility for other. So three reds becomes 5/12*5/12*5/12; 2 reds becomes 5/12*5/12*7/12 multiply by 3 (since 3 cases); 1 red is 5/12*7/12*7/12 multiply by 3 (since 3 cases); 0 red is 7/12*7/12*7/12. Out of every 10 picks, you will expect to pick all 3 reds with the chance less than once, 2 reds with the chance more than 3 times and 1 red with the chance more than 4 times and no red with the chance less than 2 times. (I forgot how to exactly represent expected value) and possibility distribution is estimated 3 reds around 7%, 2 reds around 30%, 1 red around 42% and no red around 20%.
You might be interested in
Six classrooms lost electricity this morning for 47 minutes. Determine the percent of an hour that the classrooms were without e
meriva
They were without electricity for 47 minutes.....determine the percent of an hr....so 1 hr = 60 minutes.....so they were out 47 out of 60 minutes...
47/60 = 0.783 = 78.3%.....so just type in 78.3 because ur not supposed to include the percent sign
8 0
3 years ago
Identify the y-intercept of line in the graph?
andrew11 [14]

Answer:

(0,-1)

Step-by-step explanation:

You look at where the line intercepts the y axis, which is at (0,-1)

6 0
3 years ago
Read 2 more answers
Two angles of a triangle have measures that total 135 degrees. Which equation can be used to find m, the measure of the third an
Mashutka [201]

Answer:Phytagorean thereom

Step-by-step explanation:it helps really try it.

8 0
3 years ago
Lionfish are considered an invasive species, with an annual growth rate of 67%. A scientist estimates there are 8,000 lionfish i
natita [175]

<em>Answer:</em>

<em>There would be 173,535 lionfish after 6 years.</em>

<em>Step-by-step explanation:</em>

<em>Since lionfish are considered an invasive species, with an annual growth rate of 67%, ya scientist estimates there are 8,000 lionfish in a certain bay after the first year, A) to write the explicit equation for f (n) that represents the number of lionfish in the bay after n years; B) determine how many lionfish will be in the bay after 6 years; and C) if scientists remove 1,200 fish per year from the bay after the first year, determine what is the recursive equation for f (n); the following calculations must be performed:</em>

<em></em>

<em>A)</em>

<em>8000 x 1.67 ^ n = f  </em>

<em>B)</em>

<em>8000 x 1.67 ^ 6 = X</em>

<em>8000 x 21.691961596369 = X</em>

<em>173,535.692770952 = X  </em>

<em>C)</em>

<em>(8000 - 1200 x 1 ^ n) x 1.67 ^ n = f</em>

<em>Therefore, there would be 173,535 lionfish after 6 years.</em>

5 0
2 years ago
Find all the real zeros of <br><br> f(x)=3x^3-9x^2+3x-9 <br><br><br> Can someone help me please
vaieri [72.5K]

Answer:

x=0,3

Step-by-step explanation:

start by dividing every term by 3

x^3-3x^2+x-3

group into 2 terms

(x^3-3x^2)+(x-3)

simplify as much as you can

x^2(x-3)+(x-3)

combine terms

(x^2)(x-3)

x=3, 0

4 0
3 years ago
Other questions:
  • Find the circumference and the area of a circle with diameter 2 yd . Use the value for 3.14 for , and do not round your answers.
    15·1 answer
  • 7.3 is what percent of 139?
    14·1 answer
  • Please help I will reward brainly. Which go together?
    11·2 answers
  • A recipe calls for 2 cups of sugar, 3 cups of flour,
    9·1 answer
  • What are the solutions of x^2-4x-9=29
    15·2 answers
  • Depreciation A car sells for $28,000.The car
    15·1 answer
  • I need some help, please ASAP
    6·1 answer
  • Maya goes bowling with her friends. She has a total of $25 to spend. If shoes cost $4 to
    7·1 answer
  • <img src="https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B2%7D%20%20-%206x%20-%2012" id="TexFormula1" title=" {x}^{2} - 6x - 12" alt="
    9·1 answer
  • PLEASE HELP ASAP FAST!!!
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!