WGU statistics questions with verified answers
2026\2027 A+ Grade
The probability of any event is between one and o. What is the equation for this? -
correct answer For any event A, 0 ≤ P(A) ≤ 1.
The sum of all possible probabilities is___? -
correct answer One, the equation is :P(S) = 1
What is the complement rule? or the probability that an event does not occur is 1 minus the probability
that it does occur. -
correct answer P(not A) = 1 - P(A)
In probability, "OR" means either one or the other or both. -
correct answer P(A or B) = P(event A occurs or event B occurs or both occur)
Two events that cannot occur at the same time are called -
correct answer disjoint or mutually exclusive
The Addition Rule for Disjoint Events: -
correct answer If A and B are disjoint events, then P(A or B) = P(A) + P(B).
P(A and B) = -
correct answer P(event A occurs and event B occurs)
The idea of disjoint events is -
correct answer is about whether or not it is possible for the events to occur at the same time
, The idea of independent events is about -
correct answer whether or not the events affect each other in the sense that the occurrence of one
event affects the probability of the occurrence of the other
If A and B Disjoint -
correct answer A and B can not be indepentdent
If A and B are two independent events (Multiplication Rule) -
correct answer P(A and B) = P(A) * P(B).
if A, B and C are three independent events, -
correct answer P(A and B and C) = P(A) * P(B) * P(C)
The Complement Rule, -
correct answer P(A) = 1 - P(not A),
P(L) = 1 - P(not L) = 1 - P(not O1 and not O2 and not O3 and not O4 and not O5 and not O6 and not O7
and not O8 and not O9 and not O10). -
correct answer Applying the Multiplication rule:Now, using the multiplication rule, = 1 - (.56 * .56 * .56
* .56 * .56 * .56 * .56 * .56 * .56 * .56) = 1 - .003 = .997.
P(at least one person chosen has blood type O) -
correct answer P((O and O) or (O and not O) or (not O and O)) = (.44 * .44) + (.44 * .56) + (.56 * .44) =
.6864.
If A and B are disjoint events - -
correct answer P(A and B)= 0
The General Addition Rule states that for any two events, -
correct answer P(A or B) = P(A) + P(B) - P(A and B)
When each of two outcomes has two possible values (yes/no), -
correct answer there are four possible combinations altogether, which correspond to the four possible
outcomes.
2026\2027 A+ Grade
The probability of any event is between one and o. What is the equation for this? -
correct answer For any event A, 0 ≤ P(A) ≤ 1.
The sum of all possible probabilities is___? -
correct answer One, the equation is :P(S) = 1
What is the complement rule? or the probability that an event does not occur is 1 minus the probability
that it does occur. -
correct answer P(not A) = 1 - P(A)
In probability, "OR" means either one or the other or both. -
correct answer P(A or B) = P(event A occurs or event B occurs or both occur)
Two events that cannot occur at the same time are called -
correct answer disjoint or mutually exclusive
The Addition Rule for Disjoint Events: -
correct answer If A and B are disjoint events, then P(A or B) = P(A) + P(B).
P(A and B) = -
correct answer P(event A occurs and event B occurs)
The idea of disjoint events is -
correct answer is about whether or not it is possible for the events to occur at the same time
, The idea of independent events is about -
correct answer whether or not the events affect each other in the sense that the occurrence of one
event affects the probability of the occurrence of the other
If A and B Disjoint -
correct answer A and B can not be indepentdent
If A and B are two independent events (Multiplication Rule) -
correct answer P(A and B) = P(A) * P(B).
if A, B and C are three independent events, -
correct answer P(A and B and C) = P(A) * P(B) * P(C)
The Complement Rule, -
correct answer P(A) = 1 - P(not A),
P(L) = 1 - P(not L) = 1 - P(not O1 and not O2 and not O3 and not O4 and not O5 and not O6 and not O7
and not O8 and not O9 and not O10). -
correct answer Applying the Multiplication rule:Now, using the multiplication rule, = 1 - (.56 * .56 * .56
* .56 * .56 * .56 * .56 * .56 * .56 * .56) = 1 - .003 = .997.
P(at least one person chosen has blood type O) -
correct answer P((O and O) or (O and not O) or (not O and O)) = (.44 * .44) + (.44 * .56) + (.56 * .44) =
.6864.
If A and B are disjoint events - -
correct answer P(A and B)= 0
The General Addition Rule states that for any two events, -
correct answer P(A or B) = P(A) + P(B) - P(A and B)
When each of two outcomes has two possible values (yes/no), -
correct answer there are four possible combinations altogether, which correspond to the four possible
outcomes.
