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
8090 [49]
3 years ago
6

In a class of 100 students, 25 students have hardcover and 75 students have paperback textbooks for the course. If you randomly

choose 10 students in this class, fnd the probability that 2 of them have hardcover texts in the following ways: a. the exact probability b. approximate probability using a binomial distribution
Mathematics
1 answer:
galina1969 [7]3 years ago
6 0

h = prob of hardcover = .25

p = prob of paperback = .75

a.

Prob(2 hardcover of 10) = (10 choose 2) (.25)^2 (.75)^8

= ( 10(9)/2 ) (1/4^10) (1^2 3^8)

= 295245/1048576

≈ 28.15%

b.

I think I just did the binomial distribution.  We can approximate it as a normal distribution. The mean and variance in this case are computed thus:

N=10, n=2

μ = Np = 2.5

σ² = Npq = 1.875

σ = 1.3693

P(n) = 1/(σ√2π)e^-(n-μ)/(2σ²)

P(2) = 1/(1.3693√2π)e^-(2 - 2.5)/(2 (1.875))

P(2) = 33.3%

Pretty good, not great.

You might be interested in
Help pls i have till 3:15 :(
Nesterboy [21]

Answer:

using V=w x h x l=11·12·3=396

Step-by-step explanation:

396 cm^3

8 0
1 year ago
Read 2 more answers
For the function f(x)=3x−4 , what is the ordered pair for the point on the graph when x=6 ? Show work for full credit.
Ksivusya [100]

To find the ordered pair, we simply set the x value equal to 6.

We already know the first coordinate will be 6.

f(6) = 3(6) - 4

f(6) = 18 - 4

f(6) = 14

<h3><u>The y value is 14, and so our coordinate pair is (6, 14)</u></h3>
8 0
2 years ago
In a student government election, 6 seniors, 2 juniors, and 3 sophomores are running for election. Students elect four at-large
Harrizon [31]
4-0-0
2-1-1
1-2-1
1-0-3
0-1-3


Those are just the ones I can think of so about 5 ways
3 0
3 years ago
Read 2 more answers
Quincy says that 3 is a good estimate for 3.4 X 0.09, is he correct? Why?
lord [1]
<span>Quincy says that 3 is a good estimate for 3.4 X 0.09, is she correct? Why?
When we say estimates meaning it is not the exact answer but close to what is the exact.
Now, if Quincy estimated 3 as the product of 3.4 * .09, then let’s check if she has the correct estimates.
=> 3.4 estimates is 3
=> 0.09 estimates is 0.1
Now the answer is 0.3 and not 3.
Thus, Quincy’s estimate is wrong.</span>



4 0
3 years ago
PLEASE help me with this question! This is really urgent! No nonsense answers please.
ipn [44]

Answer:

The second table of values.

Step-by-step explanation:

Let's put the x-values in the second table of values in correct number order:

x: -3, -2, -1, 0, 1

Now, let's write out the y-values in correct number order:

y: 1/4, 1, 4, 16, 64

Finally, let's rewrite the second table of values with the x-values in order and the corresponding y-values underneathe:

x: -3,  -2,  -1  0  1

y: 64,  16,  4, 1,  1/4

As it can be seen, as the x-values get bigger in value, the y-values get smaller exponentially, which is the definition of exponential decay.

6 0
3 years ago
Other questions:
  • The sum of 3 consecutive odd numbers is 51. What is the second number in this sequence?
    11·1 answer
  • Suppose you earn 6 dollars per hour at your part-time job. What will your new hourly rate be after a 2.5 percent raise? Why
    10·1 answer
  • Which equation is represented by the graph below?
    13·1 answer
  • Which expression is equivalent to 3x + 10 -x + 12
    11·1 answer
  • First One To Solve Gets Brainlyest
    10·2 answers
  • Pleasee anwser fast!!
    9·1 answer
  • Let $f(x) = 4x - 7$, $g(x) = (x + 1)^2$, and $s(x) = f(x) + g(x)$. What is $s(3)$?
    11·2 answers
  • How long does it take an account of $500 to earn $75 at a simple interest rate of 3 percent
    10·1 answer
  • Hi please help!!! i’ll give you a brainless answer (question in picture)
    5·2 answers
  • Triangle ABC is similar to DEF.
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!