Tristan would like to use his income tax return to pay off one of his four credit cards.  His previous plan was to pay off all four credit cards in the same timeline of 48 months.  He wants to eliminate the card that is charging him the most interest on a monthly basis.  The chart below outlines Tristan's four credit cards, their balances, and their APRs.  Which credit card should Tristan use his tax return to pay off? Credit Card Balance APR A $1,260.00 14% B $900.00 24% C $1,290.00 8.75% D $1,200.00 16.5%

(20 points) a bank has been receiving complaints from real estate agents that their customers have been waiting too long for mortgage confirmations. the bank prides itself on its mortgage application process and decides to investigate the claims. the bank manager takes a random sample of 20 customers whose mortgage applications have been processed in the last 6 months and finds the following wait times (in days): 5, 7, 22, 4, 12, 9, 9, 14, 3, 6, 5, 15, 10, 17, 12, 10, 9, 4, 10, 13 assume that the random variable x measures the number of days a customer waits for mortgage processing at this bank, and assume that x is normally distributed. 2a. find the sample mean of this data (x ě…). 2b. find the sample variance of x. find the variance of x ě…. for (c), (d), and (e), use the appropriate t-distribution 2c. find the 90% confidence interval for the population mean (îľ). 2d. test the hypothesis that îľ is equal to 7 at the 95% confidence level. (should you do a one-tailed or two-tailed test here? ) 2e. what is the approximate p-value of this hypothesis?