Suppose that Ricky misses his flight. What
is the probability that it was raining?

0.523
E 400

E 500
Some employers use lie detector tests to
screen job applicants. Lie detector tests are
not completely reliable. Suppose that a
polygraph can correctly detect
65% of lies,
but incorrectly identifies 16% of true
statements as lies.
Suppose that
90% of
the job applicants tell
the truth during the polygraph test.
What is
the probability that a person who fails the
test was actually telling the truth?

0.689
E 500

F 100
A basketball player has made
66% of his
foul shots during the season.
Assuming the
shots are independent, find the probability
that in tonight's game he misses for the first
time on his 6
th
attempt?

0.0426
F 100

F 200
The amount of time that an individual
must wait for the elevator by the
bookroom is represented by a uniform
distribution with mean of 15 seconds, a
standard deviation of 3.9 seconds, and a
range of 20 seconds.
What is the
probability that a random wait time is
more than 10 seconds?

0.75
F 200

F 300
A test consists of 10 true/false questions.
If a student guesses on each question,
what is the probability that the student
will answer at least
9 questions correctly?

0.0107
F 300

F 400
A company sells light bulbs in packages
of 20 and estimates that the mean number
of defective light bulbs in a package is
0.5 with a standard deviation of
0.7. If a
customer buys
12 packages, what are the
expected value and standard deviation of
the number of defective light bulbs?
Assume that packages are independent of
each other.

mean = 6
st. dev. = 2.42
F 400

F 500
For an upcoming concert, each customer may
purchase up to 3 child tickets and 3 adult tickets.
The mean and the standard deviation for the
number of adult tickets purchased by a single
customer are 2 and 1.2, respectively, and the mean
and the standard deviation for the number of child
tickets purchased by a single customer are 1 and
1.3, respectively. Suppose each child ticket costs
$15 and each adult ticket costs $25. Compute the
standard deviation of the total amount spent per
purchase
.

$35.78
F 500

The Final Jeopardy Category is:
Probability
Please record your wager.
Click on screen to begin

P( winning in game A) = 0.5, P( losing in
game B) = 0.2, and the P( losing in at least
one game) = 0.65, what is the P( winning in
at least one game)?
Click on screen to continue

0.95

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- Summer '16
- Calculus