The following statistics represent weekly salaries at the Midtown Construction Company.

Median $590 First quartile $560 Third quartile $625

Mode $580 83rd percentile $665

What salary did half the employees' salaries surpass?

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

do it yourself this is easy

step-by-step explanation: