Answer
3 inspectors.
Work Step by Step
From (a): $P(2~inspectors~do~not~identify)=0.04=4$%
Now, using the Multiplication Rule (see page 282), let's find:
$P(3~inspectors~do~not~identify)=P(inspector~1~does~not~identify)\times P(inspector~2~does~not~identify)\times P(inspector~3~does~not~identify)=0.2\times0.2\times0.2=0.008$
$P(3~inspectors~do~not~identify)=0.008=0.8$%
