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
Katyanochek1 [597]
4 years ago
12

assume that when adults with smartphones are randomly selected, 45% use them in meetings or classes. If 6 adult smartphone users

are randomly selected, find the probability that exactly 3 of them use their smartphones in meetins or classes.
Mathematics
1 answer:
Ilya [14]4 years ago
6 0

Answer:

0.3032

Step-by-step explanation:

Use binomial probability.

P = nCr p^r q^(n-r)

where n is the number of trials,

r is the number of successes,

p is the probability of success,

and q is the probability of failure (1-p).

P = ₆C₃ (0.45)³ (0.55)³

P = 0.3032

You might be interested in
me.Walker needs 22 cups of flour to bake 12 cakes.how many cups of. flour will she need to bake 30 cakes?
lara [203]
We can infer that more cups of flour are needed as the cakes are increased, so we can apply a rule of three, simple with direct proportion to find the answer:
12 cakes ----> 22 cups flour
30 cakes ----> x

x = (30)(22)/12
x = 55
therefore 55 cups of flour are needed to bake 30 cakes
5 0
4 years ago
!HELP! SHOW WORK PLEASE SO I CAN UDNERSTAND!
Nata [24]
Ok.

The volume of a cone is the volume of a cylinder over 3.

The volume of a cone is:
\frac{1}{3} \pi r^{2}h

This problem gives us the diameter, which is twice of the radius.  So, we'll just half it.
Radius (me) = 4 cm.

Substitute our given values into the equation.
\frac{1}{3} \pi (4)^{2}h \ or \  \frac{1}{3} \pi (4)^{2}(10) \ or \  \frac{1}{3} \pi (16)(10)

Multiply
\frac{1}{3} \pi(160) \ or \  \frac{1}{3} (3.14)(160) \ or \ 1.047(160)

Multiply
167.52 \ cm^{3}

This would make 167 \ cm^{3} the closest option.
4 0
4 years ago
Read 2 more answers
To create a confidence interval from a bootstrap distribution using percentiles, we keep the middle values and chop off a certai
Nataliya [291]

Answer:

a

 \frac{\alpha }{2}  =  2.5 \%

b

  N  = 25

Step-by-step explanation:

From the question we are told that

   The number of bootstrap samples is  n =  1000

From the question we are told the confidence level is  95% , hence the level of significance is    

      \alpha = (100 - 95 ) \%

=>   \alpha = 0.05

Generally the percentage of values that must be chopped off from each tail  for a 95% confidence interval is mathematically evaluated as

      \frac{\alpha }{2}  =  \frac{0.05}{2}  =  0.025 = 2.5 \%

=>    \frac{\alpha }{2}  =  2.5 \%

Generally the number of the bootstrap sample that must be chopped off to produce a 95% confidence interval is

      N  =  1000 *  \frac{\alpha }{2}

=>   N  =  1000 *  0.025

=>   N  = 25

     

4 0
4 years ago
Which inequality correctly compares two of these times? A) 54.05 > 54.15 B) 54.5 < 54.1 C) 54.15 > 54.05 D) 54.1 < 5
koban [17]

c is right answer because 54.15 is bigger than 54.05


3 0
3 years ago
The graph of y = 4x2 - 4x – 1 is shown.
11Alexandr11 [23.1K]

Answer:

i) The approximate solutions are: x_{1} \approx -0.207, x_{2} \approx 1.207.

ii) The approximate solutions are: x_{1}\approx -0.5, x_{2} \approx 1.5.

Step-by-step explanation:

i) The best approach to estimate graphically the solution of 4\cdot x^{2} - 4\cdot x - 1 = 0 is graphing the following system of equations:

y = 4\cdot x^{2}-4\cdot x - 1 (1)

y = 0 (2)

And labeling the points in which both intersects each other. We include the result in the image 'solution-i'. The approximate solutions are: x_{1} \approx -0.207, x_{2} \approx 1.207.

ii) The best approach to estimate graphically the solution of 4\cdot x^{2} - 4\cdot x - 1 = 2 is graphing the following system of equations:

y = 4\cdot x^{2}-4\cdot x - 1 (1)

y = 2 (2)

And labeling the points in which both intersects each other. We include the result in the image 'solution-ii'. The approximate solutions are: x_{1}\approx -0.5, x_{2} \approx 1.5.

5 0
4 years ago
Other questions:
  • What is 77/8 as a mixed number
    6·2 answers
  • The temperature in Ottawa starts at -4°C, rises 14°C, and then falls 8°C. What is the final temperature?
    7·2 answers
  • What is the simple interest on a loan of $16 500 for 2 years at 8 per year ?
    9·1 answer
  • S m a r t p e o p l e o n l y but like please hurry:)
    13·1 answer
  • A lawn sprinkler is set in the corner of the backyard. Thomas has the sprinkler set to rotate at 90 degrees. He knows that the s
    14·1 answer
  • Bailey has saved 54% of the money he needs to buy a new
    14·2 answers
  • 10. 12. 17<br>-- + -- + --<br>4. 6. 12​
    7·1 answer
  • Sports Warehouse had a sale on two models of baseball gloves. Model A sold for $30.00, and model B sold for $45.25. A total of 5
    7·1 answer
  • there are ten names in a hat. how many ways are there to draw three names for first, second and third prizes from the hat, assum
    13·1 answer
  • A person is connecting heat trace cable on pipe at the jobsite. The cable he or she is using is rated 2.5 watts/foot. How many f
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!