Return to the credit card scenario of exercise 12 (section 2.2), and let c be the event that the selected student has an american express card. in addition to p(a) = .6, p(b) = .4, and p(a > b.= .3, suppose that p(c) = .2, p(a > c) = .15, p(b >
c.= .1, and p(a > b >
c.= .08.
a. what is the probability that the selected student has at least one of the three types of cards?
b. what is the probability that the selected student has both a visa card and a mastercard but not an american express card?
c. calculate and interpret p(b u
a. and also p(a u b).

The westins and the shermans live in the same city and pay the same sales tax rate, and both families made $14,000 in taxable purchases last year. if the westins made $86,000 and the shermans made $33,000 last year, is the sales tax in their city an example of a regressive tax? yes, because the westins and the shermans both paid the same sales tax rate. b. no, because the shermans paid a higher percentage of their income in sales tax than the westins did. c. no, because the westins and the shermans both paid the same sales tax rate. d. yes, because the shermans paid a higher percentage of their income in sales tax than the westins did.