I need help doing this with showing work and step by step. Last person told me to use online links and that won't work for me.

People are selected to serve on juries by randomly picking names from the list of registered voters. The average age for registered voters in the county is = 39.7 years with a standard deviation of o = 12.4. A statistician randomly selects a sample of n = 16 people who are currently serving on juries. The average age for the individuals in the sample is M = 48.9 years. a. How likely is it to obtain a random sample of n = 16 jurors with an average age greater than or equal to 48.9