Answer:
0.62 = 62% probability that a U.S. adult selected at random thinks the occupation of firefighter has very great prestige.
Explanation:
A probability is the number of desired outcomes divided by the number of total outcomes.
Desired outcomes:
Adults who consider the occupation of firefighter to have very great prestige. So the number of desired outcomes is

Total outcomes.
All adults sampled. So

Probability:

0.62 = 62% probability that a U.S. adult selected at random thinks the occupation of firefighter has very great prestige.