Is the relationship between the time spent swimming and the number of weeks proportional? Complete the statements

If you could answer these your a life saver

Tom drove 206 miles in 3.9 hours. estimate his average speed.

The distribution of a sample of the outside diameters of pvc pipes approximates a symmetrical, bell-shaped distribution. the arithmetic mean is 14.0 inches, and the standard deviation is 0.1 inches. about 68% of the outside diameters lie between what two amounts?