Given: Total number of watches =
and number of defective watches =
So, the probability of selecting a detective watch =
Now,
n =
,
and
Therefore, the required probability is
.
watches is known to have
defective watches. If 8 watches are selected (one by one with replacement) at random, what is the probability that there will be at least one defective watch?
watches is known to have
defective watches. If 8 watches are selected (one by one with replacement) at random, what is the probability that there will be at least one defective watch?
Given: Total number of watches =
and number of defective watches =
So, the probability of selecting a detective watch =
Now,
n =
,
and
Therefore, the required probability is
.