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COURSE:
MSCI 3700
Name:
EXAM 2
S.S.#:
INSTRUCTOR: Professor Malouf
SEMESTER:
FALL 97
1. What is the probability that a standard normal random variable is
between 0.3 and 1.11?
a) 0.7486
b) 0.4822
c) 0.
.4222
d) 0.2514
e) 0.2486
2. What is the probability that a standard normal random variable is
between 1.3 and 2.05?
a) 0.8830
b) 0.4798
c) 0.9798
d) 0.4234
e) 1.0234
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View Full Document 3. What is the probability that a standard normal random variable is
less than 2.1?
a) 0.9821
b) 0.2088
c) 0.4821
d) 0.0179
e) 0.2907
4. The life of light bulbs is distributed normally. The average lifetime of
a bulb is 800 hours and its standard deviation is 30 hours.
What is the probability that a bulb will last at most 822.5 hours?
a) 0.0062
b) 0.2774
c) 0.7734
d) 0.9938
e) 0.2266
5.
The Eagle Electronic Company had an income of 56 million dollars
last year. Suppose the mean income of firms in the industry for the
year is 42 million dollars with a standard deviation of 6.6 million
dollars.
If incomes for the industry are distributed normally, what is the
probability that a randomly selected firm will earn less than Eagle
Electronic Company?
a) 2.22
b) 0.9830
c) 0.37935
d) 0.017
e) 0.483
6.
The yearly income of a certain state university’s MBA class of ’97 is
normally distributed with a mean of $45,700 and a standard deviation
of $7,300. At least what yearly income would be expected for the
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This note was uploaded on 03/09/2011 for the course DSCI 2710 taught by Professor Hossain during the Spring '08 term at North Texas.
 Spring '08
 Hossain

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