IEE 380 LATEST UPDATED QUESTIONS AND ANSWERS
SURE A+
✔✔Suppose the number of people who cross on a green light at Rural and University
(going south) is a Poisson random variable, X, with a mean equal to 12 people. What is
the variance of X? - ✔✔12 people^2
✔✔A standard normal random variable is referred to as the letter ________. - ✔✔Z
✔✔ you are required to use a TI-89 - ✔✔False
✔✔graph of F(x) = P(X <= x) when X is the face value for the throw of a fair die? - ✔✔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 - ✔✔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. - ✔✔infinite
✔✔The CDF is the probability that a random variable, X, is _______________ to a
specific number, x. - ✔✔less than or equal to
✔✔on a graph of the standard normal variable f(z) is on the y-axis - ✔✔false, f(x)
✔✔******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? - ✔✔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? -
✔✔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? - ✔✔5
✔✔******How many values can a Poisson random variable have? - ✔✔n
SURE A+
✔✔Suppose the number of people who cross on a green light at Rural and University
(going south) is a Poisson random variable, X, with a mean equal to 12 people. What is
the variance of X? - ✔✔12 people^2
✔✔A standard normal random variable is referred to as the letter ________. - ✔✔Z
✔✔ you are required to use a TI-89 - ✔✔False
✔✔graph of F(x) = P(X <= x) when X is the face value for the throw of a fair die? - ✔✔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 - ✔✔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. - ✔✔infinite
✔✔The CDF is the probability that a random variable, X, is _______________ to a
specific number, x. - ✔✔less than or equal to
✔✔on a graph of the standard normal variable f(z) is on the y-axis - ✔✔false, f(x)
✔✔******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? - ✔✔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? -
✔✔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? - ✔✔5
✔✔******How many values can a Poisson random variable have? - ✔✔n
