What is the probability that a randomly selected

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1. 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 80% of all customers spend at least this amount.

Find two dollar amounts, equidistant from the mean, such that 90% of all customer purchases are between these values.

Reference no: EM132539413

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