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Suppose it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately normal with mean $75 and standard deviation $20.
a. What is the probability that a randomly selected customer spends less than $85 at this store?
b. What is the probability that a randomly selected customer spends between $65 and $85 at this store?
c. What is the probability that a randomly selected customer spends more than $45 at this store?
d. Find the dollar amount such that 75% of all customers spend no more than this amount.
e. Find the dollar amount such that 80% of all customers spend at least this amount.
f. Find two dollar amounts, equidistant from the mean, such that 90% of all customer purchases are between these values.
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