The table to the right shows the results of a survey in which 400 adults from the East, 400 adults from the South, 400 adults from the Midwest, and...

The table to the right shows the results of a survey in which

400 adults from the East,

400 adults from the South,

400 adults from the Midwest, and

400 adults from the West were asked if traffic congestion is a serious problem. Complete parts (a) and (b).