People are chosen to serve on juries by randomly picking names from list of registered voters, the average age for registered voters in country is m=39.7 years with the standard deviation of s=12.4. A statistician randomly chooses a sample of n=16 people who're currently serving on juries. The average age for individuals in the sample is M=48.9 years.
a. How likely is it to obtain the random sample of n=16 jurors with the average age greater than or equal to 48.9?
b. Is it reasonable to conclude that this set of n=16 people isn't a representative random sample of registered voters?