Blood diamonds. according to global research news (mar. 4, 2014), one-fourth of all rough diamonds produced in the world are blood diamonds, i. e., diamonds mined to finance war or an insurgency. in a random sample of 700 rough diamonds purchased by a diamond buyer, let x be the number that are blood diamonds. a. find the mean of x. b. find the standard deviation of x. c. find the z-score for the value x = 200. d. find the approximate probability that the number of the 700 rough diamonds that are blood diamonds is less than or equal to 200.

-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

76%

step-by-step explanation:

24% are dogs and the remaining is 76% because 100-24=76

x equals 1

step-by-step explanation:

f(4)=f(×)

x=1