Because of the relatively high interest rates, most consumers attempt to pay off their credit card...

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Because of the relatively high interest rates, most consumersattempt to pay off their credit card bills promptly. However, thisis not always possible. An analysis of the amount of interest paidmonthly by a bank’s Visa cardholders reveals that the amount isnormally distributed with a mean of $27 and a standard deviation of$7.
(a) What proportion of the bank’s Visa cardholders pay more than$30 in interest?
(b) What proportion of the bank’s Visa cardholders pay more than$40 in interest?
(c) What proportion of the bank’s Visa cardholders pay less than$15 interest?
(d) What interest payment is exceeded by only 20% of the bank’sVisa cardholders?

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