Question 329230
a) P(prod)={{{57/100}}}
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b) P(prod or super)=P(prod)+P(super)={{{57/100+40/100=97/100}}}
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c)Yes, you're either a production worker or supervisor because {{{57+40+2+1=100}}}. I guess in this place you can't be both. 
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d) Then they must be a secretary or president.
P(not prod or super)=P(secr or pres)=P(secr)+P(pres)={{{2/100+1/100=3/100}}}
You could also have done it this way,
P(not prod or super)+P(prod or super)={{{1}}}
P(not prod or super)={{{1}}}-P(prod or super)
From b) above
P(not prod or super)={{{1-97/100=100/100-97/100=3/100}}}