<PRE><B>Question 687788</B>
a batch of 100 bulbs is known to have 5% defectives. if 10 bulbs are chosen at random, what is the probability that none of them will get defective? what is the probability that exactly two defectives will be found?
--------
5 bulbs are defective; 95 bulbs are not defective
----
# of ways to select 2 defective: 5C2*95C8
---
# of ways to select 2 randomly 100C10
----
P(select 2 defective) = [5C2*95C8]/100C2 = 0.0702
------------------------
Cheers,
Stan H.
</PRE>