Moderate# Volunteering: Mean and Standard Deviation of a Distribution

APSTAT-8MWLOF

According to U. S. Bureau of Labor Statistics, between September $2014$ and September $2015$, about $25\%$ of the population (age $16$ and older) volunteered with or through an organization at least once. Suppose this value has not changed.

In random samples of adults of size $n=50$, what is the mean and standard deviation of the number of individuals who would say they have volunteered with or through an organization at least once?