Use the Central Limit Theorem to find the probability of the indicated event, assuming that the distribution of the population data is unknown.

In a certain city, employees work an average of 18.7 hours of overtime every month, with a standard deviation of 7.6 hours. What is the probability that the average number of hours of overtime worked last month by a random sample of 120 employees in the city exceeds 20 hours?

Standard Normal Distribution Table

P(X>20)=P(X>20)=