is estimated that the balances on all Visa credit cards issued by the Bank of Connecticut have a mean of $830 and a standard deviation of $275. 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 $1410?
Round your answer to three decimal places.
b. What percentage of the Visa cards issued by this bank have a balance of $720 or more?
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