Chapter 5.7, Problem 3CC

In each of the following cases, a value of the desired quantity has been determined in some way, resulting in a number displayed on a calculator or computer screen. Your task is to round each number to a reasonable number of significant digits—up if a higher value is conservative, down if a lower value is conservative, and to the nearest value if it does not make a difference. Specify why your assumption is conservative.

(a)	The mass of an adult human riding on an elevator	178.8 pounds
(b)	The amount of milk needed to fill a cereal bowl	1.25 cups
(c)	The time it takes to sing Happy Birthday	32.67 seconds