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
Marta_Voda [28]
3 years ago
10

An urn contains balls numbered 1 through 20. A ball is chosen, returned to the urn, and a second ball is chosen. What is the pro

bability that the first and second balls will be a 8?
Mathematics
2 answers:
stira [4]3 years ago
7 0
<h2>Answer:</h2>

The probability is:

                   \dfrac{1}{400}

<h2>Step-by-step explanation:</h2>

It is given that:

An urn contains balls numbered 1 through 20.

A ball is chosen, returned to the urn, and a second ball is chosen.

This means that this is a case of a replacement.

Hence, one of the event is independent of the other.

Now we know that the probability to get a particular number of ball is:

                  \dfrac{1}{20}

( Since, there are total 20 balls and a ball of one particular number is just unique )

i.e. \text{Probability of getting a 8}=\dfrac{1}{20}

Hence, the probability that the first and second balls will be a 8 is:

=\dfrac{1}{20}\times \dfrac{1}{20}\\\\\\=\dfrac{1}{400}

dybincka [34]3 years ago
6 0

An urn contains balls numbered 1 through 20. A ball is chosen, returned to the urn, and a second ball is chosen. The probability that the first and second balls will be a 8 is  \frac{1}{400}

<h3>Further explanation </h3>

A random variable, random quantity, aleatory variable, or stochastic variable is described as a variable that the values depend on outcomes of a random phenomenon. The formal mathematical treatment of random variables is a topic in probability theory

There are two types of random variables such as discrete and continuous. Random variables can assume only a countable number of values are called discrete. Whereas the random variables that can take on any of the countless number of values in an interval are called continuous.

The chance of the first ball being a 8 is \frac{1}{20}. Similarly, the chance of the second being a 8 is \frac{1}{20}.

To find the chance if both happening, muliply the two.  

\frac{1}{20} *   \frac{1}{20}  = \frac{1}{400}

Because since you return it  \frac{1}{20}  again and those combined make  \frac{1}{400}  since 20 * 20= 400

<h3>Learn more</h3>
  1. Learn more about urn brainly.com/question/7153497
  2. Learn more about probability  ball  brainly.com/question/3372562
  3. Learn more about probability brainly.com/question/7965468

<h3>Answer details</h3>

Grade:  9

Subject:  mathematics

Chapter:  probability

Keywords: urn,  balls, probability, second, first

You might be interested in
En el juego de domino son 28 fichas con la cara hacia abajo cual es la probabilidad de sacar la ficha 6-7
9966 [12]
Shakin my head like yeah
7 0
3 years ago
A woman sold an article for 400.00and made a profit of 25%,Find ty cost price and profit​
Katarina [22]

Answer:

$100 profit, $300 cost

Step-by-step explanation:

So 25% of $400 is $100, now we know she made $100 on the article

and the other $300 was the amount used to make the article i'm asuming

7 0
3 years ago
Read 2 more answers
2/3 times 3/4<br> What is the answer?
umka21 [38]

Answer:

6/12 simplified: 1/2

Step-by-step explanation:

You just multiply the numerator by the numerator and the denominator by the denominator... 2x3 and 3x4

Hope you understand... if you have any questions just message in the box : D

7 0
2 years ago
Read 2 more answers
Find the unknown length in the right triangle. If​ necessary, approximate the length to the nearest thousandth. A: 13in and B: 2
umka2103 [35]
Use Pythagorean theorem a^2 + b^2 = c^2
13^2 + 20^2 = c^2
169 + 400 = c^2
569 = c^2 Use square root property to get c by itself. So you find the square root of both sides
23.853 = c
5 0
3 years ago
Read 2 more answers
Determine the slope of the line that has the points (-5, 8) and (-5, 3).
Anuta_ua [19.1K]

Answer:

Option D : Undefined

Step-by-step explanation:

Given points (-5,8) and (-5,3) lies on a line.

Slope of a line is given by:

m = \frac{y_2-y_1}{x_2-x_1}

m = \frac{3-8}{-5-(-5)}\\\\m=\frac{-5}{0}

Anything divided by zero is undefined.

Therefore,

Option D is the correct answer.

6 0
2 years ago
Other questions:
  • What is 10000000000000*10
    6·1 answer
  • Is a triangle with sides of the length of 6 ft, 21 ft, and 23 ft a right triangle?
    12·2 answers
  • √5/49+√20/49−2√45/49
    10·1 answer
  • Divide. ​ 2/5÷5/6 ​ Express your answer in simplest form. will give brainliest who answers it and rate 5 star
    8·1 answer
  • Please help with 18-20, thank you
    12·1 answer
  • What is the answer to this please help me. 5th grader.
    5·2 answers
  • How much more of his allowance did Nathan spend on the
    14·1 answer
  • If m&lt;PQT=60 and m&lt;PQS=4x+14 find the value if x
    9·1 answer
  • At store A, apples are $3.99 for 5 apples. At store B, apples are $20 for 10 apples. Which is the better deal?​
    12·2 answers
  • Meg the Stallion placed 8 books on each shelf of a bookcase. If she shelves 32 books. How many shelves are needed?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!