Posted by bob on Saturday, March 10, 2012 at 3:27pm.
(4.35E2  x)(7.56E2 x )
============================
(0.324 + 2x)2
Rearrange to get an expression of the form ax2 + bx + c = 0 and use the quadratic formula (solve for x. This gives:
x = 1.05E2, 0.143
basically i understand they use the quadratic equation but how did they change that crazy fraction into the quadratic formula?

math  Damon, Saturday, March 10, 2012 at 5:40pm
If that fraction = 0 (you left that out) then the denominator is not part of the problem unless it is zero.
32.88 E4  11.91 E2 x + x^2 = 0
x = [ 11.91E2 +/ sqrt(142 E4  132 E4) ] / 2
= [ .119 +/ E2 sqrt(10) ]/2
= [.119 +/ .031 ]/2
= .075 or .044 
math  trevor, Tuesday, March 13, 2012 at 12:37pm
for the following population of n=9 scores below.
11 12 16 15 19 16 13 17 11
range........
variance standard deviation s: