Through a Telephone Survey,a Low-Interest Bank Credit Card Is Offered

Essay

Through a telephone survey,a low-interest bank credit card is offered to 400 households.The responses are as tabled. $\begin{array}{lcc} & \text { Income } \leq \$ 60,000 & \text { Income }>\$ 60,000 \\\hline\text { Accept offer } & 40 & 30 \\\text { Reject offer } & 210 & 120\end{array}$
a.Develop a joint probability table and show the marginal probabilities.
b.What is the probability of a household whose income exceeds $60,000 and who rejects the offer?
c.If income is  $60,000, what is the probability the offer will be accepted?
d.If the offer is accepted, what is the probability that income exceeds $60,000?