Answer:
Step-by-step explanation:
we are given
A student randomly guesses on 10 true/false questions
so,
there only true and false
so, probability getting true question is
so, probability getting false question is
the student gets 5 out of 10 questions right
so,
r=5
we can use binomial probability formula
now, we can plug values
we can simplify it
and we get
Answer:
69.23% probability that a person is not qualified if he or she was not approved by the manager.
Step-by-step explanation:
A probability is the number of desired outcomes divided by the number of total outcomes:
In this problem, we have these following probabilities:
80% probability that a person is qualified
20% probability that a person is not qualified.
90% probability that a qualified person is approved.
10% probability that a qualified person is not approved.
10% probability that an unqualified person is approved.
90% probability that an unqualified person is not approved.
Find the probability that a person is not qualified if he or she was not approved by the manager.
Desired outcomes
Unqualified and not approved.
20% are not qualified. Of those, 90% were not approved. So
Total outcomes:
Qualified and not approved or unqualified and not approved.
80% are qualified. Of those, 10% were not approved
20% are not qualified. Of those, 90% were not approved. So
Probability
69.23% probability that a person is not qualified if he or she was not approved by the manager.