Your Name: _____________________ ____
Math 140: Statistics, Feburary 19, 2008
Quiz 4, Chapter 5, Section 1, 2, & 3
1. (6 pts.) Find the area under the normal curve:
a) to the left of –1.2
b) between –2.0 and 1.5
2. (9 pts.) The average height of one group of new Air Force recruits was 72 inches
with a standard deviation of 5 inches.
a) Convert a height of 80 inches to standard units.
b) Convert a height of 70 inches to standard units.
c) Approximate the percentage of these recruits whose height was less than 70
inches.
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