Suppose a poll of 599 adults asked whether increasing oil, gas, and coal production or developing alternative energy sources such as wind and solar power should be given a higher priority. Suppose 3 people are selected at random from this sample, and that the same person can be selected more than once. Complete parts a through d below.

Response	Number
Oil, gas, coal	169
Wind and solar	324
Equally Important	42
No opinion	24
Total	559

a) What is the probability that all three responded "Wind and solar"?