Five lists of data with 20 data values in each have arithmetic means $$a_1, a_2, a_3, a_4$$, and $$a_5$$ and medians $$m_1, m_2, m_3, m_4$$, and $$m_5$$,respectively.
Quantity A
The median of $$a_1, a_2, a_3, a_4$$, and $$a_5$$
Quantity B
The arithmetic mean of $$m_1, m_2, m_3, m_4$$, and $$m_5$$