The Bank of Connecticut issues Visa and MasterCard credit cards. It is estimated that the balances on all Visa credit cards issued by the Bank of Connecticut have a mean of $840 and a standard deviation of $260. Assume that the balances on all these Visa cards follow a normal distribution. a. What is the probability that a randomly selected Visa card issued by this bank has a balance between $900 and $1490? Round your answer to three decimal places. _______________ b. What percentage of the Visa cards issued by this bank have a balance of $725 or more? Round your answer to two decimal places. _____________ %