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Loyalty discount! If the total amount of your purchases from the seller more than:

$3 the discount is 1%
$6 the discount is 2%
$9 the discount is 3%
$12 the discount is 4%
$15 the discount is 5%
$18 the discount is 6%
$20 the discount is 7%
$30 the discount is 10%
$0.32
614. Of every ten parts, 9 satisfy the standard. Find the probability that of the 50 items taken from the warehouse, the number of standard items will be between 42 and 48?
Detailed solution. Decorated in Microsoft Word 2003 (Quest decided to use the formula editor)
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