Question 729328
.
A quality control engineer at a light bulb plant estimates that 1% of the bulbs it sells are defective. 
If you purchase a package of 3 bulbs, what is the probability that exactly one of them is defective? 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~



This is a standard problem on binomial distribution.



<pre>
Use a standard formula

    P = {{{C(3,1)*0.01^1*(1-0.01)^2}}} = {{{3*0.01*0.99^2}}} = 0.0294 (rounded).      <U>ANSWER</U>
</pre>

Solved.