(Step-by-Step) A videotape store has an average weekly gross of $1,158 with a standard deviation of $120. The store's gross receipts during a randomly selected
Question: A videotape store has an average weekly gross of $1,158 with a standard deviation of $120. The store's gross receipts during a randomly selected week follow a normal distribution.
a.) What is the probability of grossing less than $1,000 in a week?
b.) What is the 80th percentile of weekly gross receipts?
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