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for one group of middle income customers (you call this group B1), you have studied historical data and believe that the variable amount of credit
for one group of middle income customers (you call this group B1), you have studied historical data and believe that the variable "amount of credit card interest ($) in a month" has a normal distribution with a mean of $15 and a standard Deviation of $2.5. What is the long run average interest/month? what is the stdev of interest/month? what is the estimated proportion who pay > $20 interest/month?what is the estimated proportion who pay <=$10 interest/month? what is the interest that is exceeded by only 10% of the group?
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