Machine–A produces 40% of the total output and Machine-B produces 60% of the total output. An average of nine units out of a thousand goods manufactured by Machine-A and one unit of 150 units produced by Machine-B prove to be defective. What is the probability that a unit chosen at random from the total daily output of the factory is defective?
Pick one:
A) 0.76  B) 0.076  C) 0.0076  D) 0.00076  E) 7.6e-05
Let total Production be 10000 units....   A produces 4000 units and 36 units are defective   B produces 6000 units and 40 units are defective   So, Out of total 10,000 units 76 units are defective...   So the required probability = 76/10000= 
<gadget id="calculator">76/10000</gadget>
<output>19/2_500 = around 0.0076</output>
&gt; 0.0076   Answer will be (0.0076)
<result>C</result>
Machine–A produces 40% of the total output and Machine-B produces 60% of the total output. An average of nine units out of a thousand goods manufactured by Machine-A and one unit of 150 units produced by Machine-B prove to be defective. What is the probability that a unit chosen at random from the total daily output of the factory is defective?