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Katyanochek1 [597]
3 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]3 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

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2x+4=18 <br> what does 'x' equal?
astra-53 [7]

Answer:

7

Step-by-step explanation:

18-4

=14

÷2

=7.

hoped this helped

5 0
3 years ago
Nathan's boy scout troop is making M&amp;M and peanut trail mix for a future hike. The M&amp;M's cost $3 per pound and the peanu
sammy [17]
X - pounds of the M&M`s;
y - pounds of the peanuts
x + y = 30
3 x + 2 y = 74
----------------------
y = 30 - x
3 x + 2 ( 30 - x ) = 74
3 x + 60 - 2 x = 74
x = 74 - 60
x = 14
Answer:
They bought 14 pounds of M&M`s. 
6 0
3 years ago
An overhead projector enlarges the image on its glass by a scale factor of 4. A rectangle that is 3 inches wide and 7 inches lon
qwelly [4]
Just multiply the with and the length by four (considering the scale factor is 4)
3x4=12 and 7x4=28
6 0
3 years ago
In 1990, the population of Boston, Massachusetts was 574,283. In 2000, the population was 589,141. What is the percent of change
MrMuchimi

Answer:

Percent of change in population is 2.6%

Step-by-step explanation:

Given population of Boston is 574,283 measured in year 1990.

And population of Boston in year 2000 is 589,141.

We need to find percent of change in population.

So, percent change =\frac{New\ population-Old\ population}{Old\ population}\times100%

Here old population is 574,283 and new population is 589,141

Plugging these value in formula we get,

Percent change =\frac{589,141-574,283}{574,283}\times100\\\\=\frac{14858}{574,283}\times100=0.0258\times100\\\\=2.587

Rounding to nearest tenth 2.6%

8 0
3 years ago
3/v=6/3 solve proportion
earnstyle [38]

Answer:

v= 3/2

Step-by-step explanation:

multiply cross products which is 9=6v. Then divide by 6 on both sides. Simplify.

7 0
2 years ago
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