1. A Psychology instructor asked the 100 females in her class to rate their intelligence on a scale of 1 to 10. The ratings were
What proportion of the females rated their intelligence less than 7?
A. 0.20
B. 0.06
C. 0.42
2. Which of the following events are disjoint?
A. Choose a student at random from a statistics class. Event A is that the student is a Junior. Event B is that the student is a Senior.
B. Choose a student at random from a statistics class. Event A is that the student is a psychology major. Event B is that the student is a statistics major.
C. Choose a student at random from a statistics class. Event A is that the student is at least 5'8" tall. Event B is that the student weighs at least 160 pounds.