6) What is the mean (average) of this set of data: 3 4 6 7 10 15 19 21

Can some one me, i’ve been asking for so long

(mc 02.03) what set of reflections and rotations would carry rectangle abcd onto itself? reflect over the y-axis, reflect over the x-axis, rotate 180° rotate 180°, reflect over the x-axis, reflect over the line y=x reflect over the x-axis, rotate 180°, reflect over the x-axis rotate 180, reflect over the y-axis, reflect over the line y=x

Solve for n? [tex]z = \frac{3}{4} mn[/tex]