IEE 380 EXAM 1 PRACTICE TEST EXAM
2025/2026 QUESTIONS AND ANSWERS
100% PASS
You are required to use a TI-89 - ANS False
graph of F(x) = P(X <= x) when X is the face value for the throw of a fair die? - ANS x on x-axis
F(x) on y-axis
open step function for graph
The entry in the Z table (CDF of a standard normal random variable) corresponding to a row
label of 1.2 and a column label of .03 is - ANS P(Z <= 1.23) / phi(1.23)
If random variable X has a/an _______________ number of values in a finite interval of its
range, X is continuous. - ANS infinite
The CDF is the probability that a random variable, X, is _______________ to a specific number,
x. - ANS less than or equal to
on a graph of the standard normal variable f(z) is on the y-axis - ANS false, f(x)
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, ******Let x (lowercase) denote a specific measured numerical value of a random variable. How
do we denote this random variable? That is, what is the notation of the random variable? -
ANS P(X=x)
Open the text to section 3.6 and look at Example 3-16 Digital Channel. This example was part of
your reading assignment for the week.
Which of the following is the correct definition of the random variable in this example? -
ANS X is the random variable and it is the number of bits received in error out of the next
four that are transmitted.
******Suppose the pdf of X is given as f(x) = .25 for 3 < x < 8
How many numerical values can X be? - ANS 5
******How many values can a Poisson random variable have? - ANS n
Let P(X=x) be the probability that a random variable equals a specific measured numerical
value, x.
Let p(x) denote the probability mass function of that random variable, X.
Is this relationship True or False: P(X=x) = p(x) - ANS true
If Y is the face value for the throw of a fair die, then the equation ((b-a+1)^2 - 1)/12 is the
______________ of Y. - ANS variance
A normally distributed random variable that has a mean equal to 0 and a standard deviation
equal to 1 is called _____________ - ANS A standard Normal Random Variable, AKA Z
X is the face value for the throw of a fair die. What is the expected value of X? - ANS 3.5
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
2025/2026 QUESTIONS AND ANSWERS
100% PASS
You are required to use a TI-89 - ANS False
graph of F(x) = P(X <= x) when X is the face value for the throw of a fair die? - ANS x on x-axis
F(x) on y-axis
open step function for graph
The entry in the Z table (CDF of a standard normal random variable) corresponding to a row
label of 1.2 and a column label of .03 is - ANS P(Z <= 1.23) / phi(1.23)
If random variable X has a/an _______________ number of values in a finite interval of its
range, X is continuous. - ANS infinite
The CDF is the probability that a random variable, X, is _______________ to a specific number,
x. - ANS less than or equal to
on a graph of the standard normal variable f(z) is on the y-axis - ANS false, f(x)
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
, ******Let x (lowercase) denote a specific measured numerical value of a random variable. How
do we denote this random variable? That is, what is the notation of the random variable? -
ANS P(X=x)
Open the text to section 3.6 and look at Example 3-16 Digital Channel. This example was part of
your reading assignment for the week.
Which of the following is the correct definition of the random variable in this example? -
ANS X is the random variable and it is the number of bits received in error out of the next
four that are transmitted.
******Suppose the pdf of X is given as f(x) = .25 for 3 < x < 8
How many numerical values can X be? - ANS 5
******How many values can a Poisson random variable have? - ANS n
Let P(X=x) be the probability that a random variable equals a specific measured numerical
value, x.
Let p(x) denote the probability mass function of that random variable, X.
Is this relationship True or False: P(X=x) = p(x) - ANS true
If Y is the face value for the throw of a fair die, then the equation ((b-a+1)^2 - 1)/12 is the
______________ of Y. - ANS variance
A normally distributed random variable that has a mean equal to 0 and a standard deviation
equal to 1 is called _____________ - ANS A standard Normal Random Variable, AKA Z
X is the face value for the throw of a fair die. What is the expected value of X? - ANS 3.5
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED
