Day 40: Heart of Mathematics

Last time: We looked at 7.2, and were discussing the birthday problem, the calculation of probabilities, etc.
Today:
- Fact: the Average American has one testicle and one ovary!
- Sneaky sampling to get at honest answers to embarrassing questions
  - I.15
  - I.16
  - I.17
- Other problems for the section (most likely for next time):
  - II.2
  - II.5
  - II.10
  - III.1.
Next time: sample bias, dirty data, and other dangers...

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