The "median" of a set is just the middle value for an odd number of ordered elements or the average of the middle two values for an even number of ordered elements. In this case you are four elements so it would be the average of the second and third terms...
median=(12.5+13.24)/2
median=12.87 (exactly, no rounding needed)
No, because -15 have 2 corresponding elements .
You will need half of the circle with radius of 15 inches.
Area of semi-circle = (<span>πr^2)/2 = 353.25 x $1.40 = $494.55 </span>
