STT 315
Sample Problems for Exam 2
Spring 2008
1.
A fair die is given seven independent rolls. Determine the probability of getting two sixes (to 3 decimal
points).
a) .234
b) .416
c) .286
d) .184
e) none of these
2.3.
In a set of six stocks, three pay dividends. Suppose that four stocks are selected at random from the
six.
2. Determine the probability that the selected stocks include at least one that pays dividends.
3. Determine the probability that the selected stocks include the three that pay dividends
46.
Consider the discrete probability distribution:
x
1
3
4
8
P
(
X
=
x
)
0.1
0.2
0.3
0.4
4.
E
(
X
) =
5.
X
P
1
(
< 4) =
a) 0.1
b) 0.5
c) 0.6
d) 0.3
e) none of these
6.
Var
(
X
) =
710.
Let
X
denote the number of successes in twenty independent Bernoulli trials, where each trial has
probability of .80 of success. Answer (if given) is correct to 3 decimal places.
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 Spring '08
 Anderson
 Normal Distribution, 50%, 8 minutes, 40 tons, 12.00 lbs

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