1a. Explain, using English words, what "1 in a million risk of death, per year" means. How many deaths from this risk would we expect in the entire U.S., with 280 million people? (one paragraph answer)

1b.Serial dilution demonstration. Which of the following will result in a dilution of 1 ppm?

(A) 1/10th of 1/10th
(B) 1/100th of 1/100th
(C) 1/100th of 1/100th of 1/100th
(D) 1/1000
(E) 1/1000000
(F) 1/100

Answer: (C) and (E)
Note that you should be able to work this problem with different numbers, such as a 1 in a thousand risk of death per year, and with different answers.