Question from Chapter 1 (page 51) of *Mathematical Statistics*
by Keith Knight:

1.14Questions from Chapter 2 (pages 99-112) of

2.1, 2.5, 2.7, 2.12, 2.14, 2.17, 2.18, 2.25, 2.27

**Note:**
For 2.7(b), you may leave your final answer as a double sum, without
evaluating it explicitly.