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Read:
Chapter 19, Sections 1-2-7-8, and as much as you like of 3-4-5-6.
Chapter 20, Sections 1-2-3. Don't read Section 4.
   (In the word-equation on page 358: what's missing?)

Good practice problems:
Chapter 19, set A, pp. 349-350: 1, 2, 5, 6, 11 (will discuss these 4/11)
Chapter 20, set A, pp. 361ff: 2, 4 (all of them really)
Chapter 20, set B, pp. 366ff: 2 (all of them really)
Chapter 20, review, pp. 371-373: 1, 2, 3, 4 (don't turn in; will discuss 4/11)

Problems to turn in:
Chapter 19, review, pp. 351-353: 2, 4, 5, 6. (What's wrong with these surveys?)
Chapter 20, review, pp. 371-373: 6, 7, 8, 9, 10, 11.