Question
A major credit card company has determined that its customers charge an average of $280 per month on their accounts with a standard deviation of
A major credit card company has determined that its customers charge an average of $280 per month on their accounts with a standard deviation of $20. Suppose the charge follows a normal distribution.
a. What percentage of the customers charges more than $275 per month?
b. What percentage of the customers charges less than $243 per month?
c. What percentage of the customers charges between $241 and $301.60 per month?
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A First Course in Differential Equations with Modeling Applications
Authors: Dennis G. Zill
11th edition
1305965728, 978-1305965720
