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
jenyasd209 [6]
3 years ago
15

A jar contains 4 white and 4 black marbles. We randomly choose 4 marbles. If 2 of them are white and 2 are black, we stop. If no

t, we replace the marbles in the jar and again randomly select 4 marbles. This continues until exactly 2 of the 4 chosen are white. What is the probability that we shall make exactly n selections?
Mathematics
1 answer:
Airida [17]3 years ago
3 0

Answer:

<em>Find the probability of success in a single trial and then think about the nature of the problem (when do we stop).  </em>

Step-by-step explanation:

Observe that in the single trial, we have (8 4) possibilities of choosing our set of balls. If we have chosen two white balls and two black balls, the probability of doing that is simply  

p=(4 2)*(4 2)/(8 4)

This is well know Hyper geometric distribution. Now, define random variable X that marks the number of trials that have been needed to obtain the right combination (two white and two black balls). From the nature of the problem, observe that X has Geometric distribution with parameter p that has been calculated above. Hence  

P(X = n) = (1— p)^n-1 *( p )

<em>Find the probability of success in a single trial and then think about the nature of the problem (when do we stop).  </em>

You might be interested in
Evaluate the following expression: -2|9|.<br> -18<br> -11<br> 11<br> 18
Blababa [14]

Answer:

-18 mat-way is good to use

6 0
3 years ago
Could these side lengths make a right triangle, 12m, 35m and 37m
natta225 [31]

Answer:

Yes

Step-by-step explanation:

Using Pythagorean theorem WHICH ONLY WORKS FOR RIGHT TRIANGLES,

a^2+b^2=c^2 where a and b are the two shortest legs.

12^2+35^2=c^2

144+1225=c^2

c^2=1369

c=\sqrt{1369}

c=37

3 0
3 years ago
is 20% in a decimal 0.20 in fraction 20/50 54% is a 40 0.4 fraction 4/10 decimal percent 9% decimal 0.9 fraction 9/10 66% 0.66 6
Gre4nikov [31]
20% is .20/ 20/50 is 40% or .4 or 4/10/ 9% is .09 or 9/100 / 9/10 is 90% or .9/ 66% is .66 or 33/50 or 66/100/ 6/10 is 60% or 60/100 or .6/ 2% is .02 or 1/50 or 2/100. I didn't exactly understand the question, but I hope this answers your question.
7 0
3 years ago
Why does the vertical line test determine if the graph represents a function?
Irina-Kira [14]
<span>the vertical line test is a visual way to determine if a curve is a graph of a function or not.</span>
6 0
3 years ago
Read 2 more answers
A quilter has square blocks of fabric. The area of each block is 36 in.2. The quilter decides to cut the squares along one diago
Lyrx [107]
I think the answer is H but I could be wrong
8 0
3 years ago
Other questions:
  • What is the y-intercept of the line that has a slope of -1/2 and passes through the point (2, 3)?
    13·1 answer
  • Least common multiples of 18, 16,and 20
    13·2 answers
  • What is the area of ΔABC? Round to the nearest tenth of a square unit.
    10·2 answers
  • Aiko and Kendra arrive at the Texas
    5·2 answers
  • Hi can someone help me with this pleaseee
    8·1 answer
  • Mr. Mcdonald plants carrots in 5 rows of 6 six each, and he plants radishes in 8 rows of 12 each. How many vegetables did Mr. Mc
    9·1 answer
  • Need help solving this !
    11·1 answer
  • Translate the phrase into an algebraic expression. The difference of w and 2 ​
    14·1 answer
  • V) Find the perimeter of the rectangle whose length is 60m and breadth is 55m
    5·1 answer
  • h(t)=-16t+144t Find the average rate of change of the firework from maximum height until it reaches the ground
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!