ACTIVITY $1\mathrm{.}17\mathrm{.}1.$ Computing an average. Write a single statement that assigns avg$\_$sales with the average of num$\_$sales$1,$ num$\_$sales$2$ and num$\_$sales$3.$ Sample output with inputs $348$ Average sales: $5\mathrm{.}00$Given sphere$\_$radius and pi$,$ compute the volume of a sphere and assign to sphere$\_$volume. Volume of sphere $=(\frac{4\mathrm{.}0}{3\mathrm{.}0})r^3$

Sample output with input: $1\mathrm{.}0$

Sphere volume: $4\mathrm{.}19$

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$543046\mathrm{.}3884724.$ qx$3$zqy$7$

pi $=3\mathrm{.}14159$

sphere$\_$volume $=0\mathrm{.}0$

sphere$\_$radius $=$ float input $()$