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Test 7B
AP Statistics
Name:
Directions:
Work on these sheets.
Part 1:
Multiple Choice.
Circle the letter corresponding to the best answer.
A psychologist studied the number of puzzles subjects were able to solve in a fiveminute period while
listening to soothing music.
Let X be the number of puzzles completed successfully by a subject.
X
had the following distribution:
X
1
2
3
4
Probability
0.2
0.4
0.3
0.1
1.
Using the above data, what is the probability that a randomly chosen subject completes at least 3
puzzles in the fiveminute period while listening to soothing music?
(a) 0.3
(b) 0.4
(c) 0.6
(d) 0.9
(e) The answer cannot be computed from the information given.
2.
Using the above data, P(X < 3) is
(a) 0.3
(b) 0.4
(c) 0.6
(d) 0.9
(e) The answer cannot be computed from the information given.
3.
Using the above data, the mean µ of X is
(a) 2.0
(b) 2.3
(c) 2.5
(d) 3.0
(e) The answer cannot be computed from the information given.
4.
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This note was uploaded on 05/01/2011 for the course AP CLASSES 101 taught by Professor Mr.smith during the Spring '11 term at Korea Advanced Institute of Science and Technology.
 Spring '11
 MR.Smith

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