BUAL 2600 STUDYS EXAMS GUIDE QUESTIONS AND
ANSWERS SURE A+
✔✔Events that have no sample space outcomes in common, and therefore can not
occur simultaneously are ___________________ - ✔✔Mutually exclusive
✔✔Let A, B, and C be events and assume the following probabilities: P(A) = 0.2, P(B) =
0/3, P(C) = 0.5, P (A ∩ B) = 0.06, P (A ∩ C) = 0, and P (B ∩ C0 = 0.5
Which two of the three events are mutually exclusive? - ✔✔A,C
✔✔For a union, you use the ___________ rule - ✔✔addition
✔✔If two events are independent, we can ___________ their probabilities to determine
the intersection probability
P (A ∩ B) = P(A) x P(B) - ✔✔multiply
✔✔If two events are independent, we can ___________ their probabilities to determine
the union probability
P (A ∪ B) = P(A) + P(B) - P(A ∩ B) - ✔✔add
✔✔The probability that one event will occur given that we know that another event has
already occurred - ✔✔conditional probability
✔✔Variable whose value is a numerical value that is determined by the outcome of an
experiment - ✔✔random variable
✔✔A _____________ random variable has possible values that can be counted or
listed - ✔✔discrete
, ✔✔A ______________ random variable may assume any numerical value in one or
more intervals - ✔✔continuous
✔✔Number of customers who place an order, number of defective radios, number of
customers, and gender of the customer are examples of ____________ random
variable - ✔✔discrete
✔✔Time between customer arrivals in minutes, number of ounces, percentage of
project complete after six months, and temperature when the desired reaction takes
place are examples of _______________ random variable - ✔✔continuous
✔✔Which of the following is not a discrete random variable?A. The number of times a
light changes red in a 10 minute cycleB. The number of minutes required to run 1 mileC.
The number of defects in a sample selected from a population of 100 productsD. The
number of criminals found in a five mile radius of a neighborhood - ✔✔B
✔✔A table, graph, or formula that gives the probability associated with each possible
value that the variable can assume - ✔✔Discrete probability distribution
✔✔Discrete probability distribution must satisfy what 2 conditions? - ✔✔p(x)>0 and (Σ
p(x)=1)
✔✔The ________ of two events A and B is the event that consists of the sample space
outcomes belonging to both event A and event B. - ✔✔Intersection
✔✔Which of the following is not discrete random variable?
A. The number of times a light changes red in a 10-minute cycle
B. The number of minutes required to run 1 mile
C. The number of defects in a sample selected from a population of 100 products
D. The number of criminals found in a five-mile radius of a neighborhood - ✔✔B
✔✔Quantitive variable that represents outcomes from an expirement - ✔✔Random
variable
✔✔Discrete random variable is __________ - ✔✔countable
✔✔Continuous random variable is _________ - ✔✔decimals
✔✔The 2 properties for continuous probability distribution - ✔✔f(x)>0 for all x
total area under curve = 1
ANSWERS SURE A+
✔✔Events that have no sample space outcomes in common, and therefore can not
occur simultaneously are ___________________ - ✔✔Mutually exclusive
✔✔Let A, B, and C be events and assume the following probabilities: P(A) = 0.2, P(B) =
0/3, P(C) = 0.5, P (A ∩ B) = 0.06, P (A ∩ C) = 0, and P (B ∩ C0 = 0.5
Which two of the three events are mutually exclusive? - ✔✔A,C
✔✔For a union, you use the ___________ rule - ✔✔addition
✔✔If two events are independent, we can ___________ their probabilities to determine
the intersection probability
P (A ∩ B) = P(A) x P(B) - ✔✔multiply
✔✔If two events are independent, we can ___________ their probabilities to determine
the union probability
P (A ∪ B) = P(A) + P(B) - P(A ∩ B) - ✔✔add
✔✔The probability that one event will occur given that we know that another event has
already occurred - ✔✔conditional probability
✔✔Variable whose value is a numerical value that is determined by the outcome of an
experiment - ✔✔random variable
✔✔A _____________ random variable has possible values that can be counted or
listed - ✔✔discrete
, ✔✔A ______________ random variable may assume any numerical value in one or
more intervals - ✔✔continuous
✔✔Number of customers who place an order, number of defective radios, number of
customers, and gender of the customer are examples of ____________ random
variable - ✔✔discrete
✔✔Time between customer arrivals in minutes, number of ounces, percentage of
project complete after six months, and temperature when the desired reaction takes
place are examples of _______________ random variable - ✔✔continuous
✔✔Which of the following is not a discrete random variable?A. The number of times a
light changes red in a 10 minute cycleB. The number of minutes required to run 1 mileC.
The number of defects in a sample selected from a population of 100 productsD. The
number of criminals found in a five mile radius of a neighborhood - ✔✔B
✔✔A table, graph, or formula that gives the probability associated with each possible
value that the variable can assume - ✔✔Discrete probability distribution
✔✔Discrete probability distribution must satisfy what 2 conditions? - ✔✔p(x)>0 and (Σ
p(x)=1)
✔✔The ________ of two events A and B is the event that consists of the sample space
outcomes belonging to both event A and event B. - ✔✔Intersection
✔✔Which of the following is not discrete random variable?
A. The number of times a light changes red in a 10-minute cycle
B. The number of minutes required to run 1 mile
C. The number of defects in a sample selected from a population of 100 products
D. The number of criminals found in a five-mile radius of a neighborhood - ✔✔B
✔✔Quantitive variable that represents outcomes from an expirement - ✔✔Random
variable
✔✔Discrete random variable is __________ - ✔✔countable
✔✔Continuous random variable is _________ - ✔✔decimals
✔✔The 2 properties for continuous probability distribution - ✔✔f(x)>0 for all x
total area under curve = 1
