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Assume it is known that the distribution of purchase amounts by customers entering a popular retail store is approximately normal with mean $25 and standard deviation $8.
a) What is the probability that a randomly selected customer spends less than $35 at this store?
b) What is the probability that a randomly selected customer spends between $15 and $35 at this store?
c) What is the probability that a randomly selected customer spends more than $10 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 of $25, such that 90% of all customer purchases are between these values?
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