Thank you for the opportunity to help you with your question!
a) The total of the "made" column.'
b) You want to have the 'made' in numerator and total of 'many' in denominator.
Here's the basic form to prove if something is independent: P(A and B)=P(A)*P(B)
First, P(A and B)=P(few and made)=0.01
If P(few and made)=P(few)*P(made), then they are independent.
This is equal, so they are considered independent events.
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