Assume that when adults with smart phones are randomly selected 45% use them in meetings or classes if 30 adult smart phone users are randomly selected find the probability that exactly 20 of them use their smart phones in meetings or classes

2/3

Step-by-step explanation:

I think it is 2/3 because 20 is the probability and 30 are the users. So basically, it is the probability over the total in this case 30. 20/30=2/3. Hope it helps?

-3

step-by-step explanation:

a drawing really does here:

so i draw the horizontal line y=2 and the vertical line x=-2 at this intersection i put b (this is where my right angle is going to be).   so point b is at (-2,2).   point a is 5 units long and is also on y=2 so this point has to be (3,2) or (-7,2) -doesn't matter i will go with (3,2).

now we know c is at (-2,y) we don't know the y yet bet we know that c is on x=-2.

we have the area of the triangle is .5bh=12.5

we know the base length is 5 (ab)

we have the height is (2-y) if you look at your

plug in

.5(5)(2-y)=12.5

solve for y to get the y-coordinate for c

2.5(2-y)=12.5

divide both sides by 2.5 giving:

2-y=5

now subtract 2 on both sides

-y=3

y=-3

it is x=-4

step-by-step explanation: