Sat scores are normally distributed with a mean of 500 points and a standard deviation of 100 points. suppose you take the sat. several weeks later you receive your results which show you reached the 80th percentile for the math portion recalling that sat scores are always expressed as multiples of 10, how many points did you get on the test
a. 690
b. 600
c .580
d. 85
e. 550

-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

well what did you do it matters what you did : )

step-by-step explanation: