<PRE><B>Question 994434</B>
Or means either one.
Table
                       Wood ;;;;;;;;;;; Graphite ;;;  Total
Defective;;;;;;    9     ;;;;;;;;;;;      19;;;   ;;28

non-D;;;;;;     91  ;;;;;;;;;;;;;;;      81;;;;;;;172

Total---------100--------------100-------200

Probability Wood is (100/200)
Probability defective is (28/200)
Probability BOTH is (9/200)
The answer is the sum of the first two minus the third, since we have double counted.
It is (100+28-9)/200=(119/200).  It is the everything but graphite and non-defective.  </PRE>