### Question:
Stat implements Stats { @Override public double mean() { return mean.getResult(); } Stat(); void addStat(long stat); @Override long min(); @Override long max(); @Override long sum(); @Override double mean(); @Override String toString(); void clear(); @Override long num(); Stat copy();  }### Answer:
@Test public void testGetAverage() { assertEquals(0, zero.mean(), delta); assertEquals(5529, stat.mean(), delta); }