This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: : Number of pre-1982 pennies Average mass of pre-1982 pennies Number of post-1982 pennies Average mass of post-1982 pennies Average mass of a U.S. penny Percentage of pre-1982 pennies in sample Percentage of post-1982 pennies in sample 167 3.0886 358 2.5001 2.6873 31.81% 68.19% Answers to the Question: 1. In a 1000g sample of the pennies used in the experiment, how many would you expect to be pre-1982 and how many post-1982? Solution: 392.99 will be pre-1982, 607.01 will be post-1982. 2. Calculat e the weighted average mass of the pennies that you weighted. How does it compare to 3.e.above? Explain . Solution: The average mass of my pennies is 2.7924 which is heavier than the data above. Because the percentage of pre-1982 pennies in my experiment is 36% which is larger than 31.81%. What is more, the pre-1982 pennies is heavier than post-1982 pennies....
View Full Document
This note was uploaded on 12/14/2010 for the course CHM 140 taught by Professor Krish during the Spring '10 term at University of Toronto.
- Spring '10