sam purchaced 8 books ranging in price from $6.00 to $23.00.

estimate amount altoether
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We don't know how many books of each price were purchased. Minimum=8*6=$48; maximum=8*23=$184. Average total price=(1/2)(48+184)=$116. Average price of one book=29/2=$14.50, so 8 books average cost=14.50*8=$116.

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